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I am an old guy and like KISS (keep it simple stupid) approach. A small amount of leading edge wear is not unusual. Yours is more than normal. Traditionally this is caused by a poor surface on the disk. This dose not have to be large imperfections, it can be microscopic surface characteristics that can be caused buy heating and cooling over time. These are castings that are finished machined not machined from a solid piece of steel. swap right to left and see if the problem follows the disk.
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