Regarding critical damage with the revamp

So for the test results:

376*(1 + 0.2)*0.9 = 406.08 min regular
578*(1 + 0.5)*0.9 = 780.3 max regular
376*(1.3 + 0.2)*0.9 = 507.6 min double shot
578*(1.3 + 0.5)*0.9= 936.36 max double shot
Observed ranges: 444-760, 563-899

Fits, but not very well. Maybe damage isn't evenly distributed.

Well, you observed 131-146% of crits on regular damage. 136-143% on double shot, if it's additive (131-133% if it's multiplicative).

Yeah, if crits aren't well distributed you might not hit that lower 11% or upper 4% very much. (you don't have any skill crit on the char, right? 5% chance to crit might limit your observations too)