You'd have to absolutely try to melt the rotors to warp them; it's the uneven transference of pad material that causes that sensation.
The "real" guys - road racers - that I'm seeing at the track use slotted rotors, not drilled. The slots help with the off-gassing & transfer of pad material.
i agree about the pad material transfer. i know i'm not the average guy, as i turn my own rotors. it takes a long time to get the "warped" sensation, but when chucked up in my lathe, there is usually no more than a couple thou wear from new [i always record the new, out of the box, thickness]. after a .003 cut, back on they go for many, many more miles. having a lathe at home is great ! [getting to it is another matter, however.
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