Okay, did some tinkering and I think the Collective is looking a bit better.

I've messed with Control Cap a bit, bumped it up to 1/2 Character Level, but in return, I've limited Sacrificial Centrality and the other Horde Powers.

I've changed the Natural Armor into DR, which is still kinda nice, and also edited the Worm-Eaten Template.

Oh, and you don't get to choose the feats of whoever you take control of by default (if you want to ask you DM if you can mess around with feats, then go nuts). Normally, they'll keep whatever feats they had before.