can oil filter cause low PSI hot ?

Heres my sad story. I rebuilt my 273, new std oil pump, new rod bearings, new full groove main bearings, new cam and lifters/ did not replace cam bearings!! plastigauge .0015-.002 (maybe .0025) rods & mains.
Cold oil PSI about 60 (10W30)/ hot PSI 5-10 fram filter. Motor has less than 10 miles on it, and say 3 hours run time. Driving down the road @ 1800 rpm I have 35-40psi. hot idle in gear 5-7 psi.
Before I pull the pan, and install a HV oil pump.
Can a bad oil filter be causing my LOW HOT idle oil pressure ??

Also when I first start the cold engine , the mechanical gauge moves up SLOOWLY to 55-60psi.