What didn't you like about it? You cannot run the BOV and the throttle body closed at the same time. That will cause compressor surge and ruin your supercharger. The pressure has to go somewhere. Either in the motor or out to atmosphere.
Vacuum holds the BOV open and pressure (boost) holds it closed. The spring just starts it closing. At any position other than wide open throttle the engine is operating in vacuum. I have cruised at 5000 rpm and the engine is in still vacuum. At that RPM the supercharger is building a lot of pressure and that pressure is not going into the motor. I actually blew the return hose (for a more quiet operation) off my CAI when I did that. When I reattached it I accidentally crushed the plastic nipple. That is when I got compressor surge. The boost had no where to go when the motor was in vacuum. I plugged the nipple and now vent to atmosphere.
Its your choice but I think superchargers cost to much to ruin by running a heavy spring.
ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
Ret. USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1