I haven't checked my psi at the filter but at the head @ 3000rpm I'm getting 38-42 depending on the temp.
Last time it was apart I took the relief valve apart and added a stiffer spring, problem is I add new main/ rod bearings (again) at the same time so I cant tell ya if I actually received an increase in pressure.
I'm also running a bypass system that I built, pulls off the second port back on the flange and returns to the plate on the front of the engine.
I used a brass nipple about 2" long and silflossed one end shut then drilled a small hole to regulate flow. My first hole was 1/8" and that was way to large so I re-welded it up and drilled a smaller hole, cant remember at the moment exactly what size
