KMST 1.2.408 - More skill revamps

So 30% crit with an average of 1.35 extra damage per crit = 40.5% extra damage
60% crit with an average of 1.45 extra damage per crit = 87% extra damage

So 187/140.5= 1.33 times more damage before even counting the damage increases to CL. Nice.

Lol, wut?

I believe you mean:
Before this patch: 0.3 * (0.2+0.5)/2 = 0.105 = +10.5% more damage from crits = x1.105 critical multiplier
After this patch: 0.6 * (0.45+0.5)/2 = 0.285 = +28.5% more damage from crits = x1.285 critical multiplier
Average damage increase due to criticals alone: 1.285 / 1.105 = 1.1629 = +16.29% more damage

And FWIW:
Before this patch: 214% per hit
After this patch: 260% per hit
Average damage increase due to CL % alone: 260 / 214 = 1.2150 = +21.50% more damage
Total damage increase for CL: 1.1629 * 1.2150 = 1.4129 = +41.29% more damage