Critical Damage Bonus and Mind Wrack
I may have found the critical damage bonus for normal attacks and Mind Wrack. The short answer, I think, is that a normal critical does 1.33x damage (+33%), and a Mind Wrack critical does 2.33x damage (+133%). Here is how I figured it.
My operative does 52.5 damage (43-62) on a regular attack on the first burrower enemies in Numa Prime - Outer Limits. Critical hits are harder to measure (I had a much smaller example), but I was hitting those averaging 69.5 damage (59 to 80). That is exactly a 1.33x increase, or 33%. Maybe a coincidence?
Maybe not. With Mind Wrack at max skill, my average is 57.5 damage (54 to 61). With a crit (and again with a smaller sample), I was getting huge numbers, like 131-137 (and some of the hits killing the mobs outright). The average was right around 134, which is a 2.33x increase, or 133% more damage.
So does a critical add 33% more damage, and does the crit bonus of Mind Wrack (which is no longer in the skill description) effectively add 133% more damage?