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Thanks for posting a pic of your tires and your camber specs.
I run a lot of camber: -4 1/8 LF and -3 3/4 RF and zero toe. I've been willing to tolerate wear on the inside edge (much of which probably occurs on the 200 miles round trip street driving to and from the track) in order to lessen the wear on the outside edge. From what Guth with Sumitomo Rubber said, I wondered if high negative camber was causing the problem, but I still don't see how that caused the groove down the center of the LF tread. And Guth's statement that "Any type of shoulder wear could indicate inadequate air pressure and/or incorrect camber" caught my attention. I'm pretty sure shoulder wear is a fact of life with street cars like ours.
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