I have a 1:1 boost rise regulator on the return of my injection pump. It is down to 27PSI at zero boost. My SPA gage reads 28-34 at idle, and then the 1:1 takes over. I am using my return on the Fass, and if you think about it, it won't return until my fuel pressure gets to 45 psi. I have another spring to put in the FASS I would like to see more than 45 psi, but I don't think I wanted 8 psi(25 psi+ 60 psi boost), just yet out of th system. I do know several people were just restricting the return line on the FASS just during competition with a set of vice grips, or a flow control valve to get the pressure up for short bursts.