2012 GU boost controller?

[Bidja]

The solenoid is still plugged in (electrically) but the vacuum ports play no part in the system. All 3 tubes are removed. I'm not sure how blocking the air ports would make any difference??

Block them to keep dirt out so vacsol internal stays clean (just incase u may want to use one day).

Your GFB V2 Boost Controller is nothing but a spool rate adjust needle valve plus a boost limiter in a single body assy.

Not used one of these units but suggest you first adjust the rise rate screw (turn it clockwise) to obtain max spool and then only adjust the Boost Rate screw (guess turn it clockwise) to obtain max target boost (say 15-16 psi). If you cannot achieve at least this max boost some thing else is going on.
Try adjusting for the 15-16psi and if no good come back let us know and we can go from there.

If u obtain target boost then slow the spool rate to suit.

As @nipagu7 mentioned post up a pic or diagram of setup.