2 questions:
Have you run thru any deep water recently, as in deep enough to reach your rotors? It would have to be after getting the brakes really good and hot. That and braking like crazy and then parking it are the only easy way to warp rotors. They have to cool unevenly from damn near red for it to be a problem.
If you can (no clearance issues) have you tried running without the spacers to see if the problem goes away? Like you, I'm doubtful it's your problem, but anything you can totally eliminate is a plus.
Good luck!
Kirk B.
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