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Mine is tuned and had this same problem, they reflashed my TCM, and then reset adaptives. That sounds like your torque converter clutch is confused and your tcm has learned bad habits.
GM sent out a field engineer they test drove two cars, compared them, if this does not fix the problem make sure that the dealer compares it to another like for like ZL1. Their diagnostic tool will tell them the transmission is running in HOT mode, ignore that, all ZL1's run in HOT mode, it's so that the transmission doesn't freak out if you're on the track and you're beating the snot out of it.
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