I believe in having more oil pressure than I need but that is me. I would take the pump off and look closely at every part of it including the bypass spring, bypass valve and the upper housing where the valve works for damages like grooves and wear marks, replace as needed
I've ran into low oil pressure with hot 5W20Wt in my old pump gas Duster that had a lot of rod and main bearing clearances intentionally , it would idle at 15 to 18 lbs. at 850 RPM in gear with 170F+ oil temps. It would have 20 Lbs. at 1200 RPM and 30+ lbs. at 2000 RPM, 65 Lbs. at WOT above 4500 RPM up to 7500 RPM
That worked well for me