I'm having the same issue with my car at the track. New Meyle rotors and Redstuff pads. The suspension is all new. It's discouraging to hear that you tried Zimmerman rotors and are still having the same issue.
The first time at the track, the car had the rotors that were on it when I got the car, which probably weren't the original rotors (145 K), and it never warped the rotors. It did fade the brakes badly, though. At that time I had the Greenstuff pads. The rotors were pretty worn, so I got new ones and the Redstuff pads. Now no fade as far as a I can tell, because the rotors warp so badly that you can't brake hard after a few laps.
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