Here's my .02....
Theory 1: Are the rotors real shiney? Like glazed over? This is common when people run high temp pads on the street. They are designed to work at a higher operating temp, when run at low temps over a period of time will polish the rotor and reduce the amount of friction needed. Solution: lower temp pads and new rotors.
Theory 2: see #1
Try Hawk brake pads, they have a street/track and a street/autox compound.
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