I'm running about 30 psi in gear on 10W-30 at idle when very hot (195F on a 90 degree day). Idle oil pressure is a little low but nothing to worry about.
I've read in magazines that 10 lbs. per 1000 RPM is fine. There were even drag cars running 35 psi of oil pressure @ 6000 RPM "thru the lights"!! If you think about it, lower pressure is less parasitic drag on the engine......more power.