You are using a Boost Controller, correct?
If so, all boost controllers, both manual and electronic, BLEED boost off your WG so that it stays shut longer and raises Boost above the WG spring pressure. So if you're running 7psi but your WG spring is rated for say 4psi, then the WG is only "Seeing" 4 psi because the Boost control is Leaking the other 3psi.
The LAST thing you want is the FPR to get LESS boost than what it should.
So yeah, the Compressor is a fine spot for the Wg boost source.
There are no issues with the BOV and FPR being connected to the same source.
