IO Advice on Necro/Pain

I have a Mercs/Traps MM who's level 38 and is leveling up nicely. Thanks to the great defenses from FFG, I've decided to slot him for +defense and +resistance. When complete, he should be a pretty sturdy fellow.

My Necro/Pain MM, on the other hand, has proven tougher to decide on for IOs. My zombies hit really hard (nice when compared to my Mercs!), and they also do some good -tohit, which I like. /Pain, of course is all about the healing. I THINK I'd like to slot up the -tohit, but without giving up on the excellent damage I'm already doing. After all, -tohit is about the same as +defense (maybe not).

I just need some advice for how to slot this character up. I have an Achilles Heel proc and a Kismet +acc that I got from doing newspaper missions, but aside from that, I kind of stuck. Below is my skeletal build (all SOs right now), which can be adjusted depending on the IOs I eventually choose.

I play this character solo. I tried teaming with him, but he kept turning into a petless healer on each mission, which was no fun for me (I tend to play Scrappers and Brutes usually).

Villain Plan by Mids' Villain Designer 1.94
http://www.cohplanner.com/

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Ghoul Man: Level 50 Magic Mastermind
Primary Power Set: Necromancy
Secondary Power Set: Pain Domination
Power Pool: Flight
Power Pool: Leadership
Power Pool: Leaping
Ancillary Pool: Soul Mastery

Villain Profile:
Level 1: Zombie Horde -- Acc(A), Acc(3), Dmg(3), Dmg(7), Dmg(7), ToHitDeb(46)
Level 1: Nullify Pain -- EndRdx(A), Heal(5), Heal(9), Heal(11), EndRdx(34)
Level 2: Gloom -- Acc(A), RechRdx(9), Dmg(34), Dmg(34), ToHitDeb(46)
Level 4: Soothe -- EndRdx(A), EndRdx(5), Heal(17), Heal(17), Heal(19)
Level 6: Enchant Undead -- EndRdx(A)
Level 8: Share Pain -- RechRdx(A), Heal(11), Heal(19), Heal(23)
Level 10: Conduit of Pain -- EndRdx(A)
Level 12: Grave Knight -- Achilles-ResDeb%(A), Acc(13), Dmg(13), Dmg(15), Dmg(15), ToHitDeb(40)
Level 14: Fly -- Flight(A)
Level 16: Assault -- EndRdx(A)
Level 18: Maneuvers -- Ksmt-ToHit+(A), DefBuff(25), DefBuff(31), DefBuff(31)
Level 20: Suppress Pain -- Heal(A), Heal(23), Heal(25)
Level 22: Tactics -- EndRdx(A), ToHit(31), ToHit(33), ToHit(33), EndRdx(40)
Level 24: Combat Jumping -- DefBuff(A)
Level 26: Lich -- Acc(A), Acc(27), Dmg(27), Dmg(29), ToHitDeb(29), ToHitDeb(43)
Level 28: World of Pain -- RechRdx(A), RechRdx(33), ResDam(37), ResDam(37), ResDam(37)
Level 30: Hover -- DefBuff(A)
Level 32: Dark Empowerment -- EndRdx(A)
Level 35: Anguishing Cry -- Acc(A), Acc(36), RechRdx(36), RechRdx(36), RechRdx(43)
Level 38: Painbringer -- RechRdx(A), RechRdx(39), RechRdx(39), Heal(39), Heal(40)
Level 41: Night Fall -- Acc(A), Acc(42), Dmg(42), Dmg(42), ToHitDeb(43)
Level 44: Soul Tentacles -- Acc(A), Acc(45), Range(45), Range(45), Immob(46)
Level 47: Oppressive Gloom -- Acc(A), Acc(48), Dsrnt(48), Dsrnt(48)
Level 49: Dark Embrace -- EndRdx(A), ResDam(50), ResDam(50), ResDam(50)
------------
Level 1: Brawl -- Acc(A)
Level 1: Sprint -- EndRdx(A)
Level 2: Rest -- RechRdx(A)
Level 1: Supremacy
Level 4: Ninja Run
Level 2: Swift -- Run(A)
Level 2: Hurdle -- Jump(A)
Level 2: Health -- Heal(A)
Level 2: Stamina -- EndMod(A), EndMod(21), EndMod(21)
------------
Set Bonus Totals:------------
Set Bonuses:

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IMHO defence is wasted on an mm unless you have robots or force fields. Damage reduction is better because it works with bg mode. I would suggest getting hasten and some +rech.