[churchx]

Are you sure that Centrics "run hotter then OEM"? And not by chance that with more experience on track you drive faster? (more experience? different tires/speeds? brake more intensively?)
Also slots/grooves almost don't do a thing to "cooling". They are mostly there to offer more leading edge/bite for pads (mentioned "outgassing" is more for ancient pad materials, that let out lot of gases when overheated) .. but also may increase wear and a bit cracking reliability too (though not as bad as also drilled, or even more so slotted and drilled, rotors). And I doubt price will be as low as for centrics.
Braking is converting car kinetic energy into heat via friction. To slow down car from speed X to Y about the same amount of heat is made with whichever brakes/rotors. Of course, there is also bit how effectively and how soon that heat is cooled off .. but i doubt a bit for OEMs and blank centrics to differ much in that regard given same size/shape/area. Maybe, just maybe, rotor metal compound heat conductivity also plays slight role, but i don't think it will make difference more then some 10C. Even more so that if rotors are hotter, then they cool off more heat due higher temperature delta between air & rotor. So again, imho it's more how you brake now vs how you did then with OEMs.

I'd rather think of:
a) adding brake ducts
b) getting Essex AP Sprint kit, as others suggested, if oem brakes heat capacity limits how you drive/brake.