I had the little tee piece in the wastegate line around the wrong way. So the restrictor was pointing to the wastegate, rendering the boost controller ineffective and thus only 5psi everywhere.
Certainly wasn't a complete slowpoke on 5psi, as one VN SS owner found out the hard way. But let me tell you - 12psi is a whole other thing! Really feeling those power upgrades and in particular not having boost taper.
Grinning ear to ear atm, shaking from head to toe. I need a rest.

