I also have a RaceChip GTS Black, and it has been easy set-and-forget power. I set it for "7" all the time.
After my mechanic swapped out the coolant overflow tank, I thought something was wrong as the motor was noticeably down on power. Turns out the RaceChip just needed to be reset.
I've done a couple of mild brake boosts to scoot from a light, and the car feels violent.
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