IDEA: Make it so with each AP stack, the AP Boost diminishes by half.
EXAMPLE: Try to stack 10%AP aura with 10%AP buff, get 15% AP total, try to stack another 10% onto it with another buff of some sort, only get 17.5% AP.
I'm sure you get the point here, people who use multiple moves to stack AP and dominate the meta would be severely nerfed, but not into the ground. People who only have one or two AP moves wouldn't be too severely punished, however it would surely level the playing-field against cosmic people with 4 AP buffs.
ALSO: I agree with the part about the slows, too, cosmic slows too strong for how much damage they do. Do the same thing on DR if you want.
EXAMPLE: Try to stack 10%AP aura with 10%AP buff, get 15% AP total, try to stack another 10% onto it with another buff of some sort, only get 17.5% AP.
I'm sure you get the point here, people who use multiple moves to stack AP and dominate the meta would be severely nerfed, but not into the ground. People who only have one or two AP moves wouldn't be too severely punished, however it would surely level the playing-field against cosmic people with 4 AP buffs.
ALSO: I agree with the part about the slows, too, cosmic slows too strong for how much damage they do. Do the same thing on DR if you want.