Warping is not the rotor warping it is a buildup of pad deposits on the rotors in certian spots making the surface uneven. I have done this to fix mine and would suggest it to you. Get some 1000 grits sand paper and some brake cleaner, take you brake pads off so you can get a clean area to both sides of the rotor, sprat brake cleaner on the rotor and the sand it with the 1000 grit sandpaper, dry with a cloth when you are done and re-assemble your brakes and see what happens. The best thing to stop warping is better pads, such as Axxis Ultimates, Carbortech, Cobalt, and some AEM.