I had same issue. I wanted to keep the car stock for autocross classing but there was no way the tires could make it through a season due to outer shoulder wear. It looked as though the car was utilizing about a third of the tires' width. I went to GT3 LCAs because camber plates cause all sorts of classing issues with PCA. The LCAs make a big difference and can give a wider range of camber settings. They are not cheap, but do make a big difference.
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2022 PCA Zone 7 Autocross Chair
2001 Boxster 986 (base) #414
-PCA GGR: Class Champion AX12 '18, '19, '20; CC06 '21; CC05 '22; PAX 5th '19, 3rd '20, '21, & '22
-PCA Zone 7: Class Champion P14 '18, '19; P02 '20; P-03 '22; PAX Champion '20 & '21
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