Brembo rotors hold up just fine, the problem with preventing them from warping is gentle cool down. Ideally, your final lap of a session you should not use any brakes at all, which means driving well below racing pace, and using the e-brake to stop in the pits if need be, to keep pad/rotor contact to a minimum since such contact changes how the rotor dissipates heat, and can lead to warping. If you come into the pits kind of hot, hit the brakes and get out of the car and call it a day, your chance of warping rotors increases dramatically. If you find yourself needing to use the brakes frequently in the pits and on your cool down lap, jack the front of the car in the air and spin the wheels to allow the runout of the rotors to push back the pads some, then park the car in gear without the e-brake.

In 11 years of racing and being around racing, I've never seen a rotor warp if given a chance to cool down without contact.