Maybe your guage is inaccurate. Both of your numbers are off 4 PSI, so I'd look at the guage first. The right setting for your regulator depends on whats mods you have done. If you increase your fuel pressure and don't need it, the ECU will adjust the injector duty cycle to trim the fuel back a bit. Those engine computers are smart. The ECU program has nothing to do with your fuel pressure, the fuel pump is either on or off as far as the ECU knows..