Empress Ignore/boss damage calculations (DB).

[MENTION=9684]DamageCalc[/MENTION];

here boss, whipped this up quickly for you

 Spoiler

you can see the inflection point at empress seems to be 60%~ PDR, after that, a 10% increment in boss damage would be better than a 10% increment in PDR
you can notice this is only at clean status, and that if you have 10% boss (say, from DS) the inflection point is higher



that doesn't answer your question though, so here

 Spoiler

you can see that having more %boss damage actually makes %ignore better, because of the insane amounts you have, even at papulatus a small increase in ignore with a small decrease in %boss results in better damage.