In order to solo an AV, you need an endless fountain of endurance. Your build consumes 2.26 end/sec (and that's without death shroud). Your dark regen costs you 22 points of endurance and you will need it often against an AV. You will be too winded to put out constant damage. I would slot more end reducers in everything. If you'll also be doing regular content, I would put the numina recovery/regen in health to have access to it earlier, and possibly put a performance shifter proc in stamina.
Finally, while not an essential power for an AV fight, death shroud is fabulous and if you can lower your end costs, I would really consider fitting it into the build.
I'll post my SS/Dark if I can figure out Mids. It is not built to have softcapped defense like yours, but it can possibly give you end management ideas.
I was thinking of going with either the Musc Alpha with the end mod to get abit more endurance running, or the Cardiac for end reduction and a further increase to my resistance in order to cut my endurance costs. I also know I'm going to go for the Ageless Destiny, so endurance won't quite be as much of an issue with that. And as mentioned before, if the build needs to be completely reworked in order to go after AVs, costs won't be much of an issue for me, just need some hints and pointers, or even a fully fleshed out build to get me going in the right direction.
My circle is more like an egg. . .a handicapped egg. - A math professor
Okay, I keep trying to reply and getting logged out. 
I'll just say, this is my build, I just soloed Chimera, Nightstar, and Bobcat. They went down easily, but I needed Seers on Nightstar because of her smashing resistance. I had to eat a lot of blues; Ageless would have made it a non-issue (I have barrier but didn't use it). This build has a different focus than yours, but it worked well against a small sample of AVs, so maybe you can pick up some ideas from it. The fifth slot in Dark Embrace is for a gladiator's armor +def if you have the bucks; that would soft-cap it if you hover 
. (I almost never turn on hover because you can't footstomp, but during the AVs I found footstomp's end cost to not be worth it.)
Code:
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Alright. I have a bit of a request. I've got a pretty decent SS/Dark brute build that I'd like some opinions on, and also I was wondering if anyone knows how viable it will be for soloing things such as AVs. If it 'isn't' viable for AVs, I'd very much appreciate someone to retool it so that it will be able to.
Villain Plan by Mids' Villain Designer 1.942
http://www.cohplanner.com/
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Arawn Cathal: Level 50 Magic Brute
Primary Power Set: Super Strength
Secondary Power Set: Dark Armor
Power Pool: Speed
Power Pool: Leaping
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Energy Mastery
Villain Profile:
Level 1: Jab
- (A) Kinetic Combat - Accuracy/Damage: Level 35
- (3) Kinetic Combat - Damage/Endurance: Level 35
- (3) Kinetic Combat - Damage/Recharge: Level 35
- (5) Kinetic Combat - Damage/Endurance/Recharge: Level 35
Level 1: Dark Embrace- (A) Titanium Coating - Resistance: Level 50
- (23) Titanium Coating - Resistance/Endurance: Level 50
- (25) Titanium Coating - Resistance/Recharge: Level 50
- (27) Titanium Coating - Resistance/Endurance/Recharge: Level 50
- (34) Titanium Coating - Endurance/Recharge: Level 50
- (36) Titanium Coating - Endurance: Level 50
Level 2: Haymaker- (A) Kinetic Combat - Accuracy/Damage: Level 35
- (5) Kinetic Combat - Damage/Endurance: Level 35
- (15) Kinetic Combat - Damage/Recharge: Level 35
- (15) Kinetic Combat - Damage/Endurance/Recharge: Level 35
Level 4: Murky Cloud- (A) Reactive Armor - Resistance/Endurance: Level 40
- (33) Reactive Armor - Resistance/Recharge: Level 40
- (33) Reactive Armor - Resistance/Endurance/Recharge: Level 40
- (33) Reactive Armor - Resistance: Level 40
Level 6: Hasten- (A) Recharge Reduction IO: Level 50
- (7) Recharge Reduction IO: Level 50
- (7) Recharge Reduction IO: Level 50
Level 8: Knockout Blow- (A) Touch of Death - Accuracy/Damage: Level 40
- (9) Touch of Death - Damage/Endurance: Level 40
- (9) Touch of Death - Damage/Recharge: Level 40
- (11) Touch of Death - Accuracy/Damage/Endurance: Level 40
- (13) Touch of Death - Damage/Endurance/Recharge: Level 40
- (13) Touch of Death - Chance of Damage(Negative): Level 40
Level 10: Combat Jumping- (A) Luck of the Gambler - Recharge Speed: Level 50
- (11) Luck of the Gambler - Defense: Level 50
Level 12: Obsidian Shield- (A) Reactive Armor - Resistance/Endurance: Level 40
- (34) Reactive Armor - Resistance/Recharge: Level 40
- (34) Reactive Armor - Resistance: Level 40
- (36) Reactive Armor - Resistance/Endurance/Recharge: Level 40
Level 14: Super Jump- (A) Blessing of the Zephyr - Knockback Reduction (4 points): Level 50
Level 16: Dark Regeneration- (A) Doctored Wounds - Recharge: Level 50
- (17) Doctored Wounds - Heal: Level 50
- (17) Doctored Wounds - Endurance/Recharge: Level 50
- (19) Doctored Wounds - Heal/Recharge: Level 50
- (19) Doctored Wounds - Heal/Endurance/Recharge: Level 50
Level 18: Rage- (A) Gaussian's Synchronized Fire-Control - To Hit Buff: Level 50
- (46) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge: Level 50
- (46) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge/Endurance: Level 50
- (48) Gaussian's Synchronized Fire-Control - Recharge/Endurance: Level 50
- (48) Gaussian's Synchronized Fire-Control - To Hit Buff/Endurance: Level 50
- (48) Gaussian's Synchronized Fire-Control - Chance for Build Up: Level 50
Level 20: Cloak of Darkness- (A) Luck of the Gambler - Recharge Speed: Level 50
- (21) Luck of the Gambler - Defense/Endurance: Level 50
- (21) Luck of the Gambler - Defense: Level 50
- (23) Luck of the Gambler - Defense/Recharge: Level 50
Level 22: Boxing- (A) Kinetic Combat - Accuracy/Damage: Level 35
- (43) Kinetic Combat - Damage/Endurance: Level 35
- (43) Kinetic Combat - Damage/Recharge: Level 35
- (46) Kinetic Combat - Damage/Endurance/Recharge: Level 35
Level 24: Tough- (A) Steadfast Protection - Resistance/+Def 3%: Level 30
- (25) Steadfast Protection - Knockback Protection: Level 30
Level 26: Weave- (A) Luck of the Gambler - Recharge Speed: Level 50
- (27) HamiO:Enzyme Exposure
Level 28: Cloak of Fear- (A) Siphon Insight - Accuracy/ToHit Debuff: Level 50
- (29) Siphon Insight - ToHit Debuff: Level 50
- (29) Siphon Insight - ToHit Debuff/Endurance/Recharge: Level 50
- (31) Siphon Insight - Accuracy/Endurance/Recharge: Level 50
- (31) Siphon Insight - Accuracy/Recharge: Level 50
Level 30: Maneuvers- (A) Luck of the Gambler - Recharge Speed: Level 50
- (31) Luck of the Gambler - Defense/Endurance: Level 50
Level 32: Foot Stomp- (A) Obliteration - Damage: Level 50
- (37) Obliteration - Accuracy/Recharge: Level 50
- (39) Obliteration - Damage/Recharge: Level 50
- (39) Obliteration - Accuracy/Damage/Recharge: Level 50
- (39) Obliteration - Accuracy/Damage/Endurance/Recharge: Level 50
- (40) Obliteration - Chance for Smashing Damage: Level 50
Level 35: Oppressive Gloom- (A) Stupefy - Endurance/Stun: Level 50
- (40) Stupefy - Accuracy/Recharge: Level 50
- (40) Stupefy - Accuracy/Endurance: Level 50
- (42) Stupefy - Stun/Range: Level 50
- (43) Stupefy - Accuracy/Stun/Recharge: Level 50
Level 38: Soul Transfer- (A) HamiO:Peroxisome Exposure
Level 41: Superior Conditioning- (A) Performance Shifter - Chance for +End: Level 50
- (42) Performance Shifter - EndMod: Level 50
- (42) Performance Shifter - EndMod/Accuracy: Level 50
Level 44: Physical Perfection- (A) Numina's Convalescence - Heal: Level 50
- (45) Numina's Convalescence - +Regeneration/+Recovery: Level 50
- (45) Efficacy Adaptor - EndMod: Level 50
- (45) Efficacy Adaptor - EndMod/Endurance: Level 50
Level 47: Laser Beam Eyes- (A) Achilles' Heel - Chance for Res Debuff: Level 20
Level 49: Taunt- (A) Mocking Beratement - Taunt/Range: Level 50
- (50) Mocking Beratement - Taunt/Recharge: Level 50
- (50) Mocking Beratement - Taunt/Recharge/Range: Level 50
- (50) Mocking Beratement - Accuracy/Recharge: Level 50
Level 0: Born In BattleLevel 0: Marshal
Level 0: High Pain Threshold
Level 0: Invader
Level 50: Musculature Radial Paragon
Level 50: Void Radial Final Judgement
Level 50: Paralytic Radial Flawless Interface
Level 50: Ageless Core Epiphany
------------
Level 1: Brawl
- (A) Pounding Slugfest - Disorient Bonus: Level 30
Level 1: FuryLevel 1: Sprint
- (A) Unbounded Leap - +Stealth: Level 50
Level 2: Rest- (A) Recharge Reduction IO: Level 50
Level 4: Ninja RunLevel 2: Swift
- (A) Run Speed IO: Level 50
Level 2: Health- (A) Miracle - +Recovery: Level 40
- (37) Regenerative Tissue - +Regeneration: Level 30
Level 2: Hurdle- (A) Jumping IO: Level 50
Level 2: Stamina- (A) Efficacy Adaptor - EndMod: Level 50
- (36) Efficacy Adaptor - EndMod/Accuracy: Level 50
- (37) Efficacy Adaptor - EndMod/Endurance: Level 50
------------Set Bonus Totals:
- 8% DamageBuff(Smashing)
- 8% DamageBuff(Lethal)
- 8% DamageBuff(Fire)
- 8% DamageBuff(Cold)
- 8% DamageBuff(Energy)
- 8% DamageBuff(Negative)
- 8% DamageBuff(Toxic)
- 8% DamageBuff(Psionic)
- 29.3% Defense(Smashing)
- 29.3% Defense(Lethal)
- 4.25% Defense(Fire)
- 4.25% Defense(Cold)
- 6.75% Defense(Energy)
- 6.75% Defense(Negative)
- 3% Defense(Psionic)
- 25.5% Defense(Melee)
- 6.75% Defense(Ranged)
- 5.5% Defense(AoE)
- 1.8% Max End
- 4% Enhancement(Heal)
- 3% Enhancement(Stun)
- 27% Enhancement(Accuracy)
- 46.3% Enhancement(RechargeTime)
- 14% FlySpeed
- 247.4 HP (16.5%) HitPoints
- 14% JumpHeight
- 14% JumpSpeed
- Knockback (Mag -8)
- Knockup (Mag -8)
- MezResist(Held) 8.25%
- MezResist(Immobilize) 13.2%
- MezResist(Sleep) 2.2%
- MezResist(Stun) 4.4%
- MezResist(Terrorized) 2.2%
- 8% (0.13 End/sec) Recovery
- 42% (2.62 HP/sec) Regeneration
- 1.26% Resistance(Fire)
- 1.26% Resistance(Cold)
- 14% RunSpeed
- 2% XPDebtProtection
------------Set Bonuses:
Kinetic Combat
(Jab)
- MezResist(Immobilize) 2.75%
- 22.5 HP (1.5%) HitPoints
- 3.75% Defense(Smashing,Lethal), 1.88% Defense(Melee)
Titanium Coating(Dark Embrace)
- MezResist(Sleep) 2.2%
- 22.5 HP (1.5%) HitPoints
- MezResist(Stun) 2.2%
- MezResist(Held) 2.75%
- 2.5% Defense(Melee), 1.25% Defense(Lethal), 1.25% Defense(Smashing)
Kinetic Combat(Haymaker)
- MezResist(Immobilize) 2.75%
- 22.5 HP (1.5%) HitPoints
- 3.75% Defense(Smashing,Lethal), 1.88% Defense(Melee)
Reactive Armor(Murky Cloud)
- MezResist(Immobilize) 1.1%
- 1.25% Defense(Energy,Negative), 0.63% Defense(Ranged)
- 1.25% Defense(Smashing,Lethal), 0.63% Defense(Melee)
Touch of Death(Knockout Blow)
- MezResist(Immobilize) 2.75%
- 22.5 HP (1.5%) HitPoints
- 2.5% DamageBuff(All)
- MezResist(Held) 2.75%
- 3.75% Defense(Melee), 1.88% Defense(Lethal), 1.88% Defense(Smashing)
Luck of the Gambler(Combat Jumping)
- 10% (0.62 HP/sec) Regeneration
- 7.5% Enhancement(RechargeTime)
Reactive Armor(Obsidian Shield)
- MezResist(Immobilize) 1.1%
- 1.25% Defense(Energy,Negative), 0.63% Defense(Ranged)
- 1.25% Defense(Smashing,Lethal), 0.63% Defense(Melee)
Blessing of the Zephyr(Super Jump)
- Knockback (Mag -4), Knockup (Mag -4)
Doctored Wounds(Dark Regeneration)
- MezResist(Terrorized) 2.2%
- 1.26% Resistance(Fire,Cold)
- 4% Enhancement(Heal)
- 5% Enhancement(RechargeTime)
Gaussian's Synchronized Fire-Control(Rage)
- 5% JumpSpeed, 5% JumpHeight, 5% FlySpeed, 5% RunSpeed
- 28.1 HP (1.88%) HitPoints
- 2.5% (0.04 End/sec) Recovery
- 2.5% DamageBuff(All)
- 2.5% Defense(Melee), 1.25% Defense(Lethal), 1.25% Defense(Smashing), 2.5% Defense(Ranged), 1.25% Defense(Energy), 1.25% Defense(Negative), 2.5% Defense(AoE), 1.25% Defense(Fire), 1.25% Defense(Cold)
Luck of the Gambler(Cloak of Darkness)
- 10% (0.62 HP/sec) Regeneration
- 16.9 HP (1.13%) HitPoints
- 9% Enhancement(Accuracy)
- 7.5% Enhancement(RechargeTime)
Kinetic Combat(Boxing)
- MezResist(Immobilize) 2.75%
- 22.5 HP (1.5%) HitPoints
- 3.75% Defense(Smashing,Lethal), 1.88% Defense(Melee)
Steadfast Protection(Tough)
- 1.5% (0.03 End/sec) Recovery
- 3% Defense(Melee), 3% Defense(AoE), 3% Defense(Ranged), 3% Defense(Smashing), 3% Defense(Lethal), 3% Defense(Fire), 3% Defense(Cold), 3% Defense(Energy), 3% Defense(Negative), 3% Defense(Psionic)
- Knockback (Mag -4), Knockup (Mag -4)
Luck of the Gambler(Weave)
- 7.5% Enhancement(RechargeTime)
Siphon Insight(Cloak of Fear)
- 4% JumpSpeed, 4% JumpHeight, 4% FlySpeed, 4% RunSpeed
- 2% XPDebtProtection
- 9% Enhancement(Accuracy)
- 3.75% Defense(Smashing,Lethal), 1.88% Defense(Melee)
Luck of the Gambler(Maneuvers)
- 10% (0.62 HP/sec) Regeneration
- 7.5% Enhancement(RechargeTime)
Obliteration(Foot Stomp)
- MezResist(Stun) 2.2%
- 3% DamageBuff(All)
- 9% Enhancement(Accuracy)
- 5% Enhancement(RechargeTime)
- 3.75% Defense(Melee), 1.88% Defense(Lethal), 1.88% Defense(Smashing)
Stupefy(Oppressive Gloom)
- 2.5% (0.04 End/sec) Recovery
- 28.1 HP (1.88%) HitPoints
- 3% Enhancement(Stun)
- 6.25% Enhancement(RechargeTime)
Performance Shifter(Superior Conditioning)
- 5% JumpSpeed, 5% JumpHeight, 5% FlySpeed, 5% RunSpeed
- 28.1 HP (1.88%) HitPoints
Numina's Convalescence(Physical Perfection)
- 12% (0.75 HP/sec) Regeneration
Efficacy Adaptor(Physical Perfection)
- 16.9 HP (1.13%) HitPoints
Mocking Beratement(Taunt)
- 1.8% Max End
- MezResist(Held) 2.75%
- 2.5% Defense(Smashing,Lethal), 1.25% Defense(Melee)
Efficacy Adaptor(Stamina)
My circle is more like an egg. . .a handicapped egg. - A math professor