So I'm trying to figure out the best way to gem/reforge, and Mr.Robot basically is good for that. Now, I know and alot know we cannot rely entirely on Mr.Robot, some classes/specs being out of wack or something. For shadow priests, it's pretty easy though, hit > haste > mastery > crit, and unless I'm mistaken we don't have to care about haste plateaus, as haste is just best overall anyway.
Now, Mr.Robot with his optimization would lower my haste by 2% but would increase mastery by 2.6% and crit by 0.30%, while gaining some spellpower... do I go with that or, not?