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2G BOV not tight enough causing boost leak

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The point of the spring in a BOV is to keep the valve closed during vacuum, not while under boost. If it's blowing open under boost then there is a fault in the mechanism itself.
 
The pressure entering the upper chamber via the signal line from the intake manifold is what holds the valve shut during boost. If it's opening / leaking, it either needs replaced or the diaphragm needs serviced. It's basically designed as the polar opposite of how a wastegate works where the gate opens when peak boost is achieved and the BOV should only open under vacuum when no boost is being generated.
 
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