Hello,
It is more a proposition, not really a bug.
There is a cool thing in Tyranny : you can saw the % of transformation for each step.
It would be really cool if in Pillars that would be the same thing ! :
For found bugs or even generally a better comprehension of stacking rules.
EDIT : If there is a diminushing return, it is the good place to learn the true %. Like :
30 % + 10 % = 40 %....
or 37 % ?
Quote of Boeroer in another topic.