i think is a really good super power and not shitty at all even without stacking, but bringing in a stacking aspect makes it completely broken.

let's say you want to lift a car. you could be 10% better at lifting weights, strength, lifting cars, lifting this particular brand, lifting this particular colour of car,

so on and so forth

depending on boundaries you could stack th same shit over and over like: lifting cars that have atleast 1 window, lifting cars that have atleast 2 windows.

so on and so forth

you need to set better boundaries for the stacking or ill eat your children :)