Those traits don't have max caps in and of themselves. For example, I can make the strongest possible infused armor...the game is designed to allow me to pile on as many of those as I have body space for.

There are some, but very few, hard caps in the game. You're veeeeeeeeeery unlikely to hit one unless you have max champion points dumped into one specific category. You can look up hard caps, but there's a 99.99% chance you should just not worry about it.

no one is going to be able to prove this answer, because finding caps only occurs through testing. And zenimax doesn't publish what the caps are or verify them at all, so you won't get guidance from them. The best proof you'll get is to continue piling traits on. When you put on another infused piece, is your health/stam/mag going up by the expected amount? If yes, there's your proof it's working.