I feel like a few 'infinite scaling runes' could use a cap.

Especially press the attack and grasp. While press the attack is not so good in teamfights because you have to switch targets especially if you're prone to being kited, it is absolutely insane that you can stack 200 or more ad in a drawn out 1v1 fight. I mean at this point, just get botrk + this + full tank on any champion and become a godlike tier duellist just thanks to that. And I'm afraid to think of the implications on a rageblade Yi that it would probably stack on doublestrike and phantom autos, incoming +300 ad in 4s lul I don't know why Riot feels like grasp which is already good should give infinitely scaling hp. Not only does it kinda kill the purpose of sion/cho being infinite scalers, it can actually reach kinda huge values if you brawl a lot toplane. I feel like a +500 hp cap would be good. I feel gathering storm is fine, the scaling and weak early is on point. A greedy mastery like that is cool. But grasp and press the attack are just naturally really viable and incredibly powerful on a lot of metapicks, seems like they don't have any trade off for their lategame (duelling for press the attack) The % hp mastery doesn't seem to grant insane values so it should be fine I guess