[romomike]

In fact there's a post from Rogean that says:

Our code calculates it from the chance to hit perspective, so any math needs to be done from that.

chancetohit = clamp(chancetohit - (((100 - 68) * AvoidChance) / 1000)), 0, 100);

(In code, AvoidChances are * 10.. so evasive is 500).

So your chance to be hit is based off of your avoidance, which implies a hard number.