My old motor was running 80 psi at idle cold and dropped to around 60 warm (at idle)... I also was worried about it but never had a problem.

My current motor sits about 35psi hot idle and 60 cruising, except sustained cruising near highway speeds (~55mph at 3200rpm) the pressure gets erratic and drops around 40... I was told I'm probably sucking the pan (7qt) dry so I drive like a grandma on the highway