I additionally connected the puny barb on my Greddy BOV to the compressor, and I did a valve adjustment. After that, I 'm down to like 4-7 psi on a 11psi spring. Coincidence or cause? I thought BOV was too soft and leaking boost, so I tightened it. Now my high pitched BOV sound is down to a fart and a barely audible slight faint poosh. Too tight?

 

your BOV vacuum line should not go to the compressor. You should hook up that vac line to the intake manifold.. either straight to it or off a vac tee. The barb fitting on your compressor is usually hooked up to a waste gate or inline to a boost controller. This might be why you're losing boost.