[King Tut]

With uneven wear like that my guess is it is a caliper issue. I doubt the GT3 air guides or not doing the pedal dance are the primary causes. Have you only done two pad install/swaps on the calipers? I would pull the pistons out of the calipers and give them a good look. The uneven wear like that on a multi piston caliper is most likely caused by one of the pistons providing more pressure. Perhaps there is an issue with the anti-knock back spring behind one of the pistons as well.