The larger turbo will act differently than that little 18G compressor. So I am guessing the kit base boost fluctuates between 3-7 psi and creeps to 8.5 up at the top of the RPM Band. Really what you should do is put a boost controller on the car and turn up the boost to 8.5 and see if it holds. Your problem may have been boost creep.
Bryan@BNR
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