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Could this possibly be pad material buildup on the rotor, exhibiting the same symptoms as a warped rotor? Just a possibility..
If you have ruled out any caliper issues, and you think that the spindles are good, plus you state that you are really light on the brakes, pad material buildup is a possibility.
The reason I say this is that I get pad buildup and it starts a slight shuttering/vibration. The way I fix it is some really hard braking or rebedding the pads or another track event. My brakes are at there best for the first two weeks after a track event... then it starts.
In regards that the dealer says that they are warped, it could be that you have a good dealer, he just wants to fix the issue so they 'say' the rotors are warped and out of 'spec' so BMW will reimburse them for the repair. All things considered, this is a good thing, but yes, I agree that YOU want to know the root cause.
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