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That wiggle is WEIRD ... as the Blacks have much higher friction and would be the ones to introduce a wiggle -
I think the wiggle is due to the smaller rear rotors and the larger front rotors being out of balance due to the same level of friction of the pads and the rear end not doing as much work. When I went to a black pad in the rear with the smaller rotor it must match the original bias and amount of stopping force and the wiggle went away.
I just replaced the rears again and the fronts are still good, maybe half worn. If I trailered the car to the track I would put the same size Gyros all around and run the same pads on all corners.
So I have front set of Giro's need to replace the disc only, how many times can you swap disc from the hats before replacing the entire set (hat & rotors) I run PFC's 08 front and 01 rear - great balance and braking for the track little noisy on the street if you stop slowly Pm me $$ for front shipped to 33458 - thanks
I have several people who are on their 3rd ring set - the rotors last so long that the ultimate usage qty hasn't yet been seen by me :-) Check for hole concentricity (roundness)