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Your new alignment specs look good and will maximize your car for stock suspension running dual purpose street/track use, with much better tire wear. It should turn in better and feel more planted in a high speed 3rd gear sweeper. Now to add some tires with more dry grip that hold up well to continuous lapping.

I agree that the lower stress bar is the wrong tool to add negative camber to the rear. The front is where added camber pays the greatest benefits anyways. Fix that first, then evaluate the rear.