The fact that's it's happening on both sides is what has me puzzled. A sticking caliper or piston is usually on just one side. The more I think about it, the less likely it seems that it is a hydraulic problem (unless both calipers are plugged between the two sides and that's as unlikely as two frozen calipers/pistons). I'm inclined to believe that the root problem is poor braking habits, the uneven wear is normal and exaggerated by the accelerated rate of wear. YMMV
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