I agree with the re-bedding idea. I'm guessing the brakes were not bedded-in properly after they were installed, and this led to a gradual deposition of uneven pad material onto the rotor.
You don't really need to go 80-20 - just go as fast as you safely can (50-60MPH will work just fine) and slow down quickly (nearly full braking force) to 5-15 MPH. The key here is to NOT STOP. Repeat several times. I would think you could do this in a large parking lot or a deserted road.
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