My experience says it is the camber......Back in the day, when my car was dual duty street/track, I had camber set at -3.2º all the time. I ruined a set of front PSS very quickly in a very similar way. The tire looked great except for the inside edge which was showing cords......blah.
I have always run with slight toe in. Never had toe-out on my car, so that just could not have been the issue for me.
This is why I started changing camber between street and track. Once I did that, I never had any more issues with wearing the street tires too quickly.
I know Longboarder doesn't like to do those kinds of tech things to his car, but for me, it was worthwhile.
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