IB on the carnifex isn't an issue. So far, of the 8 official league games I have played so far, he has failed twice, and I wasn't even planning to move him that turn (Just getting into the habit of rolling it anyways).
I'm not too wild about stripping the broodlord down.. it could get me an extra stealer or two, but for me, his retinue is just there to soak up wounds while HE gets into combat.. most games, he is my MVP... I can toss him into almost any combat and not worry about it. 5 S6 Rending power weapon attacks on the charge is pretty wicked, and implant attack makes him a real threat to enemy
HQ's or multi wound models. And to be honest, he and his retinue don't get shot at too often. Assuming he gets to infiltrate (which is almost always), he is hidden behind terrain on turn 1... I will move up him, still out of
LOS if possible, then on turn 2, move him out to assault when I can. if not, he just moves from cover to cover. Most opponents seem more concerned with the other 37 genestealers comiing their way
Regardless... thanks for the comments! I've just had really good luck with the tooled broodlord.. at the very least, S6 is probably the "must have", because people like to toss swarms at him to tarpit the unit... with S6, he instakills entire bases... quite fun