When you read fuel pressure at idle, you do it with the vac hose disconnected from the FPR. That simulates a WOT situation where the pressure inside the manifold is equal to atmospheric. Fuel pressure with vacuum will be lower than fuel pressure at atmospheric pressure. For example, you may see that your fuel pressure at idle with the vac hose connected to the FPR is around 38psi, and the pressure with the hose off the FPR is 45psi. Your fuel pressure with the hose disconnected should be between 40-47psi. If it's at 60psi, that's way too high. As for people telling you it's better to run rich, the FMU takes care of that, so you shouldn't have to increase your base fuel pressure. You should be running stock fuel pressure, and the FMU will increase your fuel pressure dependent on manifold pressure. FMU's run incredibly rich anyway, so you don't need to add any base fuel pressure.