After doing a head, intake and injector swap I'm having trouble tuning part throttle. After checking different things from the beginning (two weeks ago) the car ran great today and after checking the psi was at 10. When I tried to lower it 2 weeks ago it would not go below 12. WTF?

I am assuming that I was running too much pressure (WOT at both pressures is good with no knocks)

The question is why is the pressure varying?

Has anyone had this problem before?

Thanks for any replys!!