Well first of all you just put your supercharger at risk of hurting itself. By cranking the "BOV", which is actually a Bypass valve or BPV, completely shut then the supercharger air is getting forced back down its throat which wreaks havoc on its bearings.
Is it open at all at idle? Is air coming out of it?...becuase that is how they are designed to work. It is supposed to be open at idle.
What dyno were you on and did they have the STD correction factor on?
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