My grinding routine is pretty much:
CS -> Mut -> KS -> Mut -> Eviscerate
Any poisonable non-elite mob should be dead by now, unless I've had horrible luck with my hits or my Seal Fate proc'ing, but if the mob is still alive I like to have the option to
Gouge -> Mutilate -> Eviscerate.
I suppose ppl are right, I'm going to be able to do all this with Deadly Poison anyway, and as my gouge is right after my evis, I could just change that to an Envenom and probably be fine anyway... Thanks everyone for the input. This kind of random theorycrafting is what keeps me going while I'm stuck at work away from WoW

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