[Dark_5.0]

Judging by your ET and mph your car is making about 320 RWHP which is about 368 HP at the flywheel.

I think your fuel pressure gauge might be messed up cause @43psi your car would be running pretty rich.
and @50psi it would be running way rich.

IMO its either your gauge or your Fuel pump.

As far as setting the fuel pressure you are adjusting the WOT fuel pressure. @WOT there is zero vacuum. That is why you set the fuel pressure with the vacuum hose disconnected. If you unplug the hose with the car running the fuel pressure should shoot up to where you set it at and then you when you plug the hose back in it should drop back down.