I did some more testing.
Set the SARD on 50psi base pressure and went for a drive with the vac line off. No fluctuations of fuel pressure on boost. Confirmed the fuel pump is 100% operational
Installed a Gen 2 Legacy TT OEM
FPR with a base pressure of 48psi that I got off Teejay. Set boost for 14psi. Hit 62psi fuel pressure at 14psi of boost. That is correct operation for a 1:1 rising rate
FPR. Although the TT
FPR base pressure is quite high, its still operating correctly. Also, as soon as engine is turned off, fuel pressure is maintained in the lines
Confirmed the SARD is faulty. Sending it back for replacement.