The odd wear is due to a minute amount of deflection plus, as Mark said, different pressures on the different ball tracks. I think I had something similar on my RC-Lab and it never worked right then either. The only way to reduce wear, is to mount the balls as far out as possible and support the diff plate up to the point where the balls contact the plate.
In the end, the plate is a wear rate item, it has a finite life, some diff's are better than others.
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