Hey sup man,
I got the profec B in my car and I m boosting 14 PSI on high. It took me a while to figure out the setting as well. I drove my car for like 6 months and the boost was fine if i would floor it only after 3000RPM otherwise it would stutter and hesitate. I don t know about the profec b spec 2 but I figured out on my BC that I had to set the balance switch as well that is important in order to get constant boost. Just play with it. I leave mine at around 10 O'clock. It has to be on mild rather than on sharp. On my bc I have little marks around the balance switch just try to turn it on the left til it is set on the second mark. Hope it will help you and sorry I speak French dude!
And yeah by the way you never get full boost on first and second! At least not on my car...
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