The way I read it for the first time was like this:
“Say I have 25 ttunement. 4% of 25 is 1. Wait what? That’s very weak. Forget it.”
I took me a few weeks to realize that what it actually means “increase by 4% per point of your Attunement”.
So… change all occurences of such wording to “increased by X% per point of your stat”, pretty please?