Are You planning / looking into going with composite rotors as well as pads?
The ceramics are “supposed to” have better thermal properties; whereas: while withstanding the “more rapid” temp changes (heavy braking and more efficient cooling).
Other then that, I would think that a larger rotor would aid in more rapid cooling, but You have to start modifying things on the spindle for the new caliper position… yes?
With rapid cooling after heavy braking (what I was trying to touch on above), are there any realistic concerns of warpage? As an extreme example, throw a 800* F. rotor into a bucket of 60* F. water… Obviously Your system won’t work that well, but is it even a valid concern?