you dont need the recharges in the second upgrade as the recharge has been reduced. 2 endreds would suffice now 
great build though
One big problem.
You took Detonator on that build.
IMO, that's a seriously not worth it Tier 9 power. Use the power slot for something more useful. Like Triage Beacon.
Triage isn't a massive +regen, but it's significant, and since most of the Thugs are ranged, then keeping them in the Triage radius with an Acid Mortar for company and a Poison Trap and Trip Mine in case anything gets too close can be remarkable effective Or so I've found 
Admittedly I'm talking from the POV of a Robotics/Traps, but unless you can use detonator on one of your disposable Gang war summons (Which I seriously doubt) then the idea of sacrificing part of your ongoing damage output for a brief (and not overly spectacular) pulse of damage goes against the way I MM.
your mileage may vary of course, but this post was brought to you by The Society Against Detonator And Other Crappy Tier 9 Powers
Warning:
The above post may contain Cynicism, sarcasm and/or pessimism. If you object to the quantities contained, then tough.
Yeah i agree with you Canine. Even though the healing isn't huge, it can ease the workload on yourself, because it heals the small injuries - while your healing the big ones. When i'm missioning, i've never been so busy with healing as i'm now 
Ok, I've never really played a MM before, but I'm really enjoying this guy so far. So he's the build I'm working towards. Any problems shouting out at you?
(Oh, PPP slotting is mostly guesswork, Hero Builder doesn't have all the info)
---------------------------------------------
Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder - (http://sherksilver.coldfront.net/index.php)
---------------------------------------------
Name: Clauricaun
Level: 50
Archetype: Mastermind
Primary: Thugs
Secondary: Traps
---------------------------------------------
01) --> Call Thugs==> Acc(1) Acc(3) Dmg(3) Dmg(5) Dmg(5) Acc(7)
01) --> Web Grenade==> Acc(1)
02) --> Dual Wield==> Acc(2) Dmg(9) Dmg(9)
04) --> Caltrops==> Dmg(4) Dmg(7)
06) --> Equip Thugs==> Rechg(6)
08) --> Hover==> Fly(8)
10) --> Acid Mortar==> Acc(10) DefDeBuf(11) Rechg(11) Dmg(25) Dmg(34)
12) --> Call Enforcer==> Acc(12) Dmg(13) Dmg(13) Dmg(15) Acc(15) TH_Buf(25)
14) --> Fly==> Fly(14) Fly(37) EndRdx(40)
16) --> Force Field Generator==> DefBuf(16) DefBuf(17) DefBuf(17)
18) --> Gang War==> Acc(18) Dmg(19) Dmg(19) Rechg(21) Rechg(23) Rechg(23)
20) --> Poison Trap==> Rechg(20) Slow(21)
22) --> Aid Other==> Heal(22) Heal(34) Heal(34) Rechg(36) IntRdx(43)
24) --> Aid Self==> Heal(24) Heal(36) Heal(43) IntRdx(43) Rechg(46)
26) --> Call Bruiser==> Acc(26) Dmg(27) Dmg(27) Acc(29) Dmg(31)
28) --> Seeker Drones==> Acc(28) TH_DeBuf(29) TH_DeBuf(31) TH_DeBuf(33)
30) --> Assault==> EndRdx(30) EndRdx(31)
32) --> Upgrade Equipment==> Rechg(32) Rechg(33) Rechg(33) EndRdx(37)
35) --> Trip Mine==> Acc(35) Dmg(36) Dmg(37) Dmg(40)
38) --> Detonator==> Acc(38) Dmg(39) Dmg(39) Dmg(39) Rechg(40)
41) --> Web Envelope==> Acc(41) Acc(42) Immob(42) Rechg(42)
44) --> Scorpion Shield==> DefBuf(44) DefBuf(45) DefBuf(45) EndRdx(45) EndRdx(46) DmgRes(46)
47) --> Tactics==> EndRdx(47) EndRdx(48) TH_Buf(48) TH_Buf(48) TH_Buf(50)
49) --> Mace Beam Volley==> Acc(49) Dmg(50) Dmg(50)
---------------------------------------------
01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
01) --> Supremacy==> Empty(1)
02) --> Rest==> Empty(2)
---------------------------------------------