In my expeience, it takes a lot of negative camber to really affect tire wear. Something like -3.5 degrees or more, which is way more than you could possibly get with stock suspension. Just a little toe though does have a big effect on tire wear.
I agree with others 99.9% probability that you have toe issues. Check all those rubber bushings too.
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Kippis

986S
991S
Van Diemen RF97
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