whomp whomp whomp

Something isn't right with your oiling system. I am running a stock replacment pump and at a cold start I have 65 at idle then I slowly drops down to about 35 when warm. Cruising down the road once warm I am running about 50 psi. I am also running 20/50 VR1.

Did you pull your oil pump when you had your engine apart and possibly damage your oil pump seal causing a leak and loss of pressure?