I mean I believe the saving throws were changed to be multiplicative. That is, in a multiplicative saving throw, with an enemy of 1 bodybuilding if you have a 50% chance to apply a status, you actually have a 50% TIMES .85 chance to apply the status, which is a 42.5% to apply.
An additive (or rather, subtractive) saving throw means that you would have a 50% MINUS 15% chance to apply, which is 35% chance to apply. Big difference, especially with smaller application chances, where the multiplicative effect is obviously much smaller than a 15% subtraction per WP/BB. I believe the Enhanced Edition changed the saving throw from additive to multiplicative, perhaps specifically to not make weapon proc effects completely useless.
