Grav/Rad pool powers?

I am playing Meshale quite some time now and have found myself discarding a lot of the primary and secondary powers, leaving myself with loads of space for pool powers, but I can't find a combination I am happy with.
Basically my build concept is a team controller who holds and debuffs enemies. Doing damage? Not my job! I almost always lead teams containing one tank and then a host of damage dealers, the ideal scenario being the tank herds then I debuff, hold and keep them locked down until my team mates polish them off. This led to the build below - Hero Plan by Mids' Hero Designer 1.20
http://www.honourableunited.org.uk/mhd.php

Meshale: Level 50 Mutation Controller
Primary Power Set: Gravity Control
Secondary Power Set: Radiation Emission
Power Pool: Speed
Power Pool: Fitness
Power Pool: Medicine
Power Pool: Teleportation
Ancillary Pool: Ice Mastery

Hero Profile:
Level 1: Crush -- Immob(A), Immob(5), Acc(34)
Level 1: Radiant Aura -- Heal(A)
Level 2: Radiation Infection -- DefDeb(A), DefDeb(3), ToHitDeb(3), ToHitDeb(5), EndRdx(11), EndRdx(13)
Level 4: Gravity Distortion -- Hold(A), Hold(7), Hold(36), Acc(42), RechRdx(42), RechRdx(43)
Level 6: Accelerate Metabolism -- EndMod(A), EndMod(7), EndMod(9), RechRdx(9), RechRdx(11), RechRdx(13)
Level 8: Crushing Field -- Immob(A), Immob(17), Immob(31), Acc(40), RechRdx(43)
Level 10: Enervating Field -- EndRdx(A), EndRdx(15), EndRdx(15)
Level 12: Hasten -- RechRdx(A), RechRdx(17), RechRdx(19)
Level 14: Super Speed -- Run(A), Run(37)
Level 16: Mutation -- RechRdx(A)
Level 18: Hurdle -- Jump(A), Jump(19), Jump(21)
Level 20: Gravity Distortion Field -- Hold(A), Hold(21), Hold(23), RechRdx(23), RechRdx(25), RechRdx(25)
Level 22: Health -- Heal(A), Heal(27), Heal(27)
Level 24: Stamina -- EndMod(A), EndMod(29), EndMod(29)
Level 26: Wormhole -- Acc(A), Acc(31), Dsrnt(31), RechRdx(37), RechRdx(37)
Level 28: Stimulant -- IntRdx(A), IntRdx(36)
Level 30: Recall Friend -- RechRdx(A)
Level 32: Singularity -- Acc(A), Hold(33), Hold(33), Immob(33), Immob(34), Dmg(34)
Level 35: Swift -- Run(A), Run(36), Run(45)
Level 38: EM Pulse -- EndMod(A), EndMod(39), Hold(39), Hold(39), Hold(40), Acc(40)
Level 41: Ice Blast -- Acc(A), Dmg(42), Dmg(43), Dmg(46), RechRdx(46)
Level 44: Frozen Armor -- DefBuff(A), DefBuff(45), ResDam(45), ResDam(46), EndRdx(50)
Level 47: Ice Storm -- Dmg(A), Dmg(48), Dmg(48), Slow(48), RechRdx(50), Slow(50)
Level 49: Teleport -- Range(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Containment

Here are some tips, trying to stay in line with how you want to play your troller (PvE, team support).

Concerning pool powers, I would skip Medecine. Your heal is not the best but it's OK fully slotted (and it's AoE). You would get more out of Leadership (either Assault for +dmg or Maneuvers for a bit of +def, and useful for IO set slotting, then Tactics, and preferably Vengeance too). Otherwise, Leaping would give you more mobility and some kback protection in Acro (which you can also get from IOs now). Recall Friend can be handy if you're taking Mutation, but I wouldn't bother with TP.

Concerning power slotting, some suggestions (using SOs):

- Crush: 2 Acc. Damage is actually not that bad, although the Immob can be more useful vs AVs.
- Radiant Aura: at least slot the 3 Heals and if possible 1-2 Rechgs.
- Rad Infection: make sure you have 3 Tht_Debufs. Much more important than EndRdx.
- Crushing Field: 2 Acc 1 EndRdx is all it needs.
- Hurdle: why the 3 jumps? Only worth it for PvP.
- GDF: 2 Acc 2 Hold 2 Rechg. As an AoE it has a huge Acc penalty.
- Health: better now because of IOs, still not worth 3 slots for a squishy imo.
- Wormhole: try to fit in a Range enhance, makes a big difference.
- Sing: can be slotted in many different ways. With SOs, I would do 1 Acc 3 Dmg 2 Holds. Even if you don't want a damage build, it has 2 attacks which do damage (Lift and Crush), so it will spam them more often than the hold. I guess Immob is also useful vs AVs (tip: slot Sing with HOs later on).
- EM Pulse: also needs 2 Acc. The EndMod is only worth it if you have Power Boost or someone on your team with -recov powers. Usual slotting is 2 Acc 2 Hold 2 Rechg.
- Epics: I'm not sure Ice has the best synergy with your sets, but if you really want it, skip the silly blast and take Hibernate. The +res in the shield is only against Cold, so not worth enhancing. 1-2 EndRdx and 3 Def_Buf is all you need. For Ice Storm, slot 3 Dmg 3 Rechg, not worth enhancing Slows but you want it up as much as possible. If you really don't want a damage build, you might consider Primal Mastery which gives you Power Boost which would work very well will many of your powers (holds, immobs, slows, heal, def, etc.), but it depends on your playstyle.
- Lingering Rad: get it asap. Major power for the AV fights in the 40s (even after nerf). Slot 2 Acc 3 Rechg.

Hope some of this helps!

Agree with Okton (we gotta stop agreeing with each other).

For the AOE mezzes IOs are great, I went with as many Acc/Recharge/Hold (or Acc/Recharge/Stun for Wormhole with a Stun/Range or two as well) as possible. Note that Wormhole doesn't have the same Accuracy penalty as GDF though, its normal accuracy so you don't need as much Acc.

My Grav/TA IO build is here, you might find the Grav slotting handy for Singy and the AOEs. Crushing field I have 3 Damage Procs in for evilness.

Agreed that Power Boost would work really well with Grav/Rad too, it'd make you an unreal control/debuff monster. Power Boosted EMP would be just evil.

thanks for the advice, definitely taking it!
I have 3 jumps in hurdle because SS as a travel power wrecks my head with its lack of vertical movement, is use those slots to keep my sanity so they probably will stay.
I was interested in the advice on Rad Inf, I slotted this early without stamina and I guess I never re-dressed it, although my build is never low on end I guess I have room to remove end rdx until I hit the right balance!

I'll try the IO slotting you suggest as I have done very little with IOs since they appeared. Thanks again.