Where is the wear on your rear tires, middle, inside, outside? Your alignment is within spec. Maybe since your last alignment, nuts came loose? I have -1.9 and .06 for the rears and have normal wear after 2k miles. Tires can last up to 20k. Your springs shouldn't take more than a few days to settle, the rubber parts may keep compressing for a week.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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