I can’t recall the article now, and it’s 12:30AM, so I’m not looking for it right now, but there was something from one of the brake makers (SRAM, Shimano, Magura, ?) that warned about using rotors that are too big. They don’t get hot enough, and braking performance suffers. If you’re not having issues with fade, your brakes are not too small. You should have some mild discoloration of the rotor once you’ve bedded it in, and done some decently hard braking. If you’re not getting that, your brakes aren’t getting hot enough. At least, that’s what I recall at the moment.
-Tim