Personally I would either build for one defensive goal - get close to 45% in either Ranged or Smash/Lethal. Below is a build which is focused on S/L - I couldnt get DEF to ENERGY as high as yours it is close to yours but all other numbers and values are posted.
I included both Power Boost and Total Focus in the build. Power Boost is one of the main reasons to take Energy Manipulation - and it enhances not just your base Defense but also Holds/Heals/Stuns/To Hit etc. Hence the slotting on powers like Hibernate etc.
But be aware the build I posted is going to be expensive. How close is your build on live to the one you posted?
Hero Plan by Mids' Hero Designer 1.81
http://www.cohplanner.com/
Click this DataLink to open the build!
Iceblink: Level 50 Natural Blaster
Primary Power Set: Ice Blast
Secondary Power Set: Energy Manipulation
Power Pool: Flight
Power Pool: Fighting
Power Pool: Speed
Ancillary Pool: Cold Mastery
Hero Profile:
Level 1: Ice Blast -- Thundr-Acc/Dmg(A), Thundr-Acc/Dmg/Rchg(7), Thundr-Acc/Dmg/EndRdx(7), Dev'n-Dmg/EndRdx(36), Dev'n-Dmg/Rchg(36)
Level 1: Power Thrust -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(48), KntkC'bat-Dmg/Rchg(48), KntkC'bat-Knock%(48)
Level 2: Ice Bolt -- Thundr-Acc/Dmg/EndRdx(A), Thundr-Acc/Dmg/Rchg(9), Thundr-Acc/Dmg(9), Dev'n-Dmg/EndRdx(37), Dev'n-Dmg/Rchg(37)
Level 4: Build Up -- RechRdx-I(A), RechRdx-I(11), Rec'dRet-Pcptn(11), Rec'dRet-ToHit(25)
Level 6: Hover -- Zephyr-Travel(A), Zephyr-Travel/EndRdx(13), Ksmt-ToHit+(13)
Level 8: Freeze Ray -- BasGaze-Acc/Hold(A), BasGaze-Acc/Rchg(15), BasGaze-EndRdx/Rchg/Hold(15), BasGaze-Acc/EndRdx/Rchg/Hold(43), Lock-%Hold(43)
Level 10: Bone Smasher -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(17), KntkC'bat-Dmg/Rchg(17), KntkC'bat-Dmg/EndRdx/Rchg(34), Mako-Acc/Dmg/EndRdx/Rchg(37)
Level 12: Aim -- RechRdx-I(A), RechRdx-I(19), Rec'dRet-ToHit(19), Rec'dRet-ToHit/Rchg(25)
Level 14: Fly -- Zephyr-Travel(A), Zephyr-Travel/EndRdx(50)
Level 16: Boxing -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(21), KntkC'bat-Dmg/Rchg(21), KntkC'bat-Knock%(34)
Level 18: Bitter Ice Blast -- Thundr-Acc/Dmg(A), Thundr-Acc/Dmg/Rchg(23), Thundr-Acc/Dmg/EndRdx(23), Dev'n-Dmg/EndRdx(42), Dev'n-Dmg/Rchg(46)
Level 20: Tough -- S'fstPrt-ResDam/Def+(A), S'fstPrt-ResKB(42)
Level 22: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def(27), LkGmblr-Def/EndRdx(27), LkGmblr-Def/EndRdx/Rchg(34)
Level 24: Ice Storm -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(29), Posi-Dmg/Rchg(29), Posi-Dmg/Rng(40), Posi-Acc/Dmg/EndRdx(40)
Level 26: Bitter Freeze Ray -- BasGaze-Acc/Hold(A), BasGaze-Acc/Rchg(31), BasGaze-EndRdx/Rchg/Hold(31), BasGaze-Acc/EndRdx/Rchg/Hold(43), Lock-%Hold(46)
Level 28: Power Boost -- RechRdx-I(A), RechRdx-I(31)
Level 30: Hasten -- RechRdx-I(A), RechRdx-I(36)
Level 32: Blizzard -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(33), Posi-Dmg/Rchg(33), Posi-Dmg/Rng(33), Posi-Acc/Dmg/EndRdx(40)
Level 35: Boost Range -- RechRdx-I(A)
Level 38: Total Focus -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(39), KntkC'bat-Dmg/Rchg(39), KntkC'bat-Dmg/EndRdx/Rchg(39), Mako-Acc/Dmg/EndRdx/Rchg(46)
Level 41: Snow Storm -- EndRdx-I(A), EndRdx-I(42)
Level 44: Frozen Armor -- LkGmblr-Rchg+(A), LkGmblr-Def(45), LkGmblr-Def/EndRdx(45), LkGmblr-Def/EndRdx/Rchg(45)
Level 47: Hoarfrost -- RechRdx-I(A), RechRdx-I(50)
Level 49: Hibernate -- RechRdx-I(A), RechRdx-I(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A), Empty(3)
Level 2: Rest -- Empty(A), Empty(3), Empty(5), Empty(5)
Level 1: Defiance
Level 4: Ninja Run
------------
Set Bonus Totals:
- 21.75% Defense(Smashing)
- 21.75% Defense(Lethal)
- 3% Defense(Fire)
- 3% Defense(Cold)
- 16.75% Defense(Energy)
- 16.75% Defense(Negative)
- 3% Defense(Psionic)
- 12.38% Defense(Melee)
- 11.75% Defense(Ranged)
- 3% Defense(AoE)
- 42.5% Enhancement(RechargeTime)
- 36% Enhancement(Accuracy)
- 99.39 HP (8.248%) HitPoints
- Knockback (Mag -4)
- Knockup (Mag -4)
- MezResist(Immobilize) 11%
- 20% Perception
- 16.5% (0.276 End/sec) Recovery
- 56% (2.817 HP/sec) Regeneration
- 3.15% Resistance(Fire)
- 3.15% Resistance(Cold)
Code:
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@Deadboy
It looks like a very viable build, although I'm not too happy with the slotting for Ice Storm and Blizzard, even if it does give a recharge boost. I might make that one my second build with some adjustments, hehe. 
Ideon's Paragonwiki page
Member of Paragon/Rogue Knights
Arc: 60092 - Supa Rumble in the Park
"Keep living the dream, and never let any jerk tell you what to do."
-- High-Roller
I've always been a bit bothered about my Ice/Energy blaster's fragileness in PvE, so with i19 coming up, I've reworked much more defence (from like zero, haha), along with the fighting pool. The level 41 IOs are because I want to exemplar down a certain amount while retaining defence (plus, the blaster is only level 40). Slots in Sprint and Rest are for Health (Numina regen/recovery and Miracle recovery) and Stamina (mix of normal IOs and Performance Shifter end and end proc).
Hero Plan by Mids' Hero Designer 1.81
http://www.cohplanner.com/
Click this DataLink to open the build!
Iceblink i19: Level 50 Natural Blaster
Primary Power Set: Ice Blast
Secondary Power Set: Energy Manipulation
Power Pool: Flight
Power Pool: Leaping
Power Pool: Speed
Power Pool: Fighting
Ancillary Pool: Cold Mastery
Hero Profile:
Level 1: Ice Blast
- (A) Thunderstrike - Accuracy/Damage
- (3) Thunderstrike - Damage/Endurance
- (5) Thunderstrike - Damage/Recharge
- (11) Thunderstrike - Accuracy/Damage/Recharge
- (13) Thunderstrike - Accuracy/Damage/Endurance
- (21) Thunderstrike - Damage/Endurance/Recharge
Level 1: Power Thrust- (A) Kinetic Crash - Accuracy/Knockback
- (43) Kinetic Crash - Recharge/Endurance
- (46) Kinetic Crash - Accuracy/Damage/Knockback
Level 2: Ice Bolt- (A) Thunderstrike - Accuracy/Damage
- (3) Thunderstrike - Damage/Endurance
- (5) Thunderstrike - Damage/Recharge
- (11) Thunderstrike - Accuracy/Damage/Recharge
- (13) Thunderstrike - Accuracy/Damage/Endurance
- (33) Thunderstrike - Damage/Endurance/Recharge
Level 4: Build Up- (A) Rectified Reticle - To Hit Buff
- (7) Rectified Reticle - To Hit Buff/Recharge
- (7) Recharge Reduction IO
- (50) Rectified Reticle - Increased Perception
Level 6: Hover- (A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
- (29) Blessing of the Zephyr - Knockback Reduction (4 points)
- (37) Luck of the Gambler - Recharge Speed
- (39) Luck of the Gambler - Defense
Level 8: Freeze Ray- (A) Lockdown - Accuracy/Hold
- (9) Lockdown - Accuracy/Recharge
- (9) Lockdown - Recharge/Hold
- (15) Lockdown - Endurance/Recharge/Hold
- (15) Lockdown - Accuracy/Endurance/Recharge/Hold
- (17) Lockdown - Chance for +2 Mag Hold
Level 10: Aim- (A) Rectified Reticle - To Hit Buff
- (29) Rectified Reticle - To Hit Buff/Recharge
- (39) Recharge Reduction IO
Level 12: Bone Smasher- (A) Crushing Impact - Accuracy/Damage
- (42) Crushing Impact - Accuracy/Damage/Recharge
- (42) Crushing Impact - Damage/Endurance
- (43) Crushing Impact - Accuracy/Damage/Endurance
- (43) Crushing Impact - Damage/Endurance/Recharge
Level 14: Fly- (A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range
- (40) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
Level 16: Conserve Power- (A) Recharge Reduction IO
- (40) Recharge Reduction IO
- (40) Recharge Reduction IO
Level 18: Bitter Ice Blast- (A) Thunderstrike - Accuracy/Damage
- (19) Thunderstrike - Damage/Endurance
- (19) Thunderstrike - Damage/Recharge
- (25) Thunderstrike - Accuracy/Damage/Recharge
- (25) Thunderstrike - Accuracy/Damage/Endurance
- (31) Thunderstrike - Damage/Endurance/Recharge
Level 20: Combat Jumping- (A) Luck of the Gambler - Recharge Speed
Level 22: Hasten- (A) Recharge Reduction IO
- (23) Recharge Reduction IO
- (23) Recharge Reduction IO
Level 24: Ice Storm- (A) Positron's Blast - Damage/Recharge
- (37) Detonation - Damage/Recharge
- (37) Air Burst - Damage/Recharge
- (46) Tempered Readiness - Endurance/Recharge/Slow
Level 26: Bitter Freeze Ray- (A) Lockdown - Accuracy/Hold
- (27) Lockdown - Accuracy/Recharge
- (27) Lockdown - Recharge/Hold
- (31) Lockdown - Endurance/Recharge/Hold
- (31) Lockdown - Accuracy/Endurance/Recharge/Hold
- (34) Lockdown - Chance for +2 Mag Hold
Level 28: Boxing- (A) Accuracy IO
Level 30: Tough- (A) Steadfast Protection - Resistance/+Def 3%
Level 32: Blizzard- (A) Positron's Blast - Damage/Recharge
- (33) Detonation - Damage/Recharge
- (33) Air Burst - Damage/Recharge
- (46) Tempered Readiness - Endurance/Recharge/Slow
Level 35: Weave- (A) Luck of the Gambler - Recharge Speed
- (36) Luck of the Gambler - Defense
- (36) Luck of the Gambler - Defense/Endurance
- (36) Luck of the Gambler - Defense/Endurance/Recharge
Level 38: Boost Range- (A) Recharge Reduction IO
- (39) Recharge Reduction IO
Level 41: Snow Storm- (A) Tempered Readiness - Endurance/Recharge/Slow
- (42) Pacing of the Turtle - Endurance/Recharge/Slow
Level 44: Frozen Armor- (A) Luck of the Gambler - Recharge Speed
- (45) Luck of the Gambler - Defense
- (45) Luck of the Gambler - Defense/Endurance
- (45) Luck of the Gambler - Defense/Endurance/Recharge
Level 47: Hoarfrost- (A) Doctored Wounds - Heal/Endurance
- (48) Doctored Wounds - Heal/Recharge
- (48) Doctored Wounds - Heal/Endurance/Recharge
- (48) Doctored Wounds - Heal
- (50) Doctored Wounds - Recharge
Level 49: Hibernate- (A) Recharge Reduction IO
- (50) Recharge Reduction IO
------------Level 1: Brawl
- (A) Accuracy IO
Level 1: Sprint- (A) Empty
- (34) Empty
Level 2: Rest- (A) Empty
- (17) Empty
- (21) Empty
- (34) Empty
Level 1: DefianceLevel 4: Ninja Run
Defence values are (at level 50, using level 41 IO sets):
Smashing/Lethal = 33.1%
Fire/Cold = 15.4%
Energy/Negative = 29.2%
Psionic = 12.9%
Melee = 14.8%
Range = 34.2%
AoE = 17.9
With one small purple, I can become softcapped to Range and most forms of melee attacks (that is, if it has a Smash or Lethal component). For AoE... I'll just have to deal, haha.
Any possible improvements? Build Up and Aim may seem to have a long recharge, but I tend to find I rarely use them much anyway (I keep wanting to save them for certain enemies and then end up forgetting about them at times, haha). I tried using Total Focus, but it's just a bit too slow for my tastes (althought that was on my old build), despite being a powerful melee attack.
Ideon's Paragonwiki page
Member of Paragon/Rogue Knights
Arc: 60092 - Supa Rumble in the Park
"Keep living the dream, and never let any jerk tell you what to do."
-- High-Roller