PonDeRing about PDR

I literally just tested and both are like.. wrong.
I must be doing something wrong here, lol.

 Spoiler

Code:

[((Damage Range*Skill%)*Critical)*Y]* DamageInc
10796~12701

Maxed Marksmanship: 20% ignore.
Monster def: 10% PDR
Suggested: y=(def-ignore)/100 y>-1
Suggested: y=def*ignore y>-1
Suggested 1: 0% defence
Suggested 2: 8% defence.
Suggestion 1 Range: 10796-12701
Suggestion 2 range: 9932-11684
Maximum observed(no crit): 12061
Minimum observed(no crit): 10082
Conclusion: no idea.

This was tested with my bowmaster with just a bow on on rashes. No total damage or anything.

Edit: tested more and minimum was 9987.