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The Titan was one-shotting everything.
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Since the patch my pets have more HP than I do, so this isn't a problem anymore. (Pre-patch, lvl 40 imp - 340 hp: Post-patch, lvl 40 imp - 930 hp)
Controllers can never have enough accuracy. Get Tactics and 6 Slot it! I would recommend getting tactics at 30 and having 4 slots in it when you get your pets. Then add 1 at 34 and 1 at 36. It makes a world of difference and Leadership has been fixed post patch (no more door mission/"join my team and quit" fixes!).
Pre-patch, I ran 4 recharge and 2 damage. Fulcrum easily made the imps hit in the 3 digit range, but if I ran up on a small group it would take 15 mins to arrest them. Post-patch I'm running 3 recharge and 3 damage. Which works out great for me, considering the Fulcrum "fix". I'll do some testing and see how well the other arrangements work.
A major flaw in your formula is considering how may imps spawn w/ each group. It's between 2-5. (which considering the last patch should have been raised to 3-5). Yes, i've gotten 3 groups of 2 out before and it sucks. And i've gotten 12+ out before and it's freakin' crazy! You can't hardly walk b/c the stupid imps get in the way.