How hot was your
oil temps after 30 mins at 2200rpm? REAL hot I would guess. This is the hottest your
oil will probably ever get. That also means the thinnest and lowest pressure you will ever see. Drop in the 50w and under normal driving conditions, I bet you will be pleased.
Besides that, if 37psi was your worst pressure, this would never cause a problem for a street engine. This would be too low for track work though.
2 cents worth.
Bob