Ignore def doesn't stack

Your formula is wrong. It doesn't take away from it being 100%(100-35=65). It's 35% of the actual pdrate which is 25. So you would only ignore 8.75% of the pdrate with the current def ignore you have of 35%, not 16.25% like you say you should, atleast I always thought that's how def ignore worked.

you ignore 35% of 25% = 8.75%, 25%-8.75%(the ignored def) = 16.25% left on the monster, what did I do wrong? You are basically calculating how much is 35% of 25% and subtracting it from 25%, I did it by taking 35% from 100% which is 65%, and 65%*25% = 16.25% which both ends up with the exact same result