I've used the EBC greenstuff on the track and they work great. I spent more than 20 minutes lapping without any sign of brake fade. One other thing, brake pads will not cause a brake rotor to warp. The normal cause of warpage is uneven cooling. Some of the things to becarful about are: washing your car when the rotors are hot, when you do this you spray water on one side of the rotor only; holding your foot on the brake after a hard stop, this causes one spot on the rotor to get heat soaked by the pads while the rest of the rotor is cooling; parking the car after coming off the track, if you've used them hard drive the car around and let them cool a bit before stopping. This is getting too long so just think about how they are being cooled.
