Two basic questions first before chasing things. Have you tried another 370z 7at to confirm yours is truly acting different? Also what has the service conditions for the trans been? I know they say lifetime fluid but that's usually just so the manufacture can advertise their low maintenance cost, if it's got some miles on it may consider flushing the atf, I think it was about 8 qts will get it really clean (2 drain and fills back to back).
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