Some nerf ideas for Tahm Kench that I don't think would effect his overall gameplay that drastically

So basically, we all know how annoying this big beefy catfish can be. He stacks a ton of health, can save allies and disable enemies, and has decent built-in sustain that also gives him 2 effective healthbars in the form of Grey Health and Grey Shield. That last part is the aspect I wanted to focus on. I'm all for tanks having shields that scale with their health. But I am NOT fine with tanks having shields that can potentially scale with 99% of their health. For the sake of balance and kit consistency, I think that Grey Shield should only protect Tahm for as much health as Grey Health would regenerate, not the entire section of the bar he lost prior to activating it. If not that, give it some other kind of cap. Such as "Grey Shield can not exceed [Insert Number]% of Tahm's max health". This would help to tone down what I and several people I know think of as the most obnoxious part of TK's kit. The other thing we disliked about his kit was the ult passive that gave him good damage that scaled with his HP, but Riot has nerfed that in the recent patch and it has felt a bit more reasonable since.

I may be wrong, since I'm definitely no Kench main, so I want to know what you guys think. Kench mains, would his shield having a cap like I described be reasonable? Or do you believe it is too much? Share your thoughts, discuss!