Do 30% Boss, Total Dmg and Atk Stack (post-BB) ?

yup, got that, i was just clarifying my question, but also, judging from this:



i can assume it's still unknown if potential ignore is multiplicative or additive tight?
i'd love to test it, but as a DrK, either I ignore all defense, or I ignore none :S

Oh it's known, but I specifically don't know.