I got a couple of questions:
In the current live build the best Mutilate spec is
this with Webbed Death/Webbed Death, IP/IP, SnD/Rupture/Evisc glyphs and using Eviscerate instead of Envenom (if the target is not poisoned by other classes, applying Wound Poison still outdps's the regular WB/SR, envenom spec) according to all the spreadsheets. Have you tried comparing that spec to the spec in your config on PTR or did Envenom become that much better in 3.1?
I also noticed that your Mutilate PTR config you only use 2 glyphs (Rupture and Slice and Dice), but I could imagine Glyphs of Hunger for Blood/Mutilate would increase your dps :P