So far no one has found an attack penalty for exenterator.

I'm nowhere near as mathy as byrth and I was only comparing unstacked exent vs. evisc. Stacked they should be a bit closer. I don't have any concrete numbers unstacked but exent was doing 2.5-3k and that's a lowball for my eviscerations which can easily go up to 5k unstacked and average 3.5k. Both with Apoc RR and GH. I had +72 AGI in gear which is about 10-12 short of the max possible.

Also the Clionids you were messing with do take extra damage while casting and on top of that are weak to piercing.