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psi at speed is good.

i guess i could get one of those adjustable screws for the pump and crank up the pressure a little huh.

They don't work at idle are to set pressure limit
http://summitracing.com/parts/MIL-21550/
your best bet would be the oil cooler and remote filter cooling oils and adding more oil to the system. maybe a dual filter set up?? LOL!!
15 lb at idle is fine my worry would be a momentary starvation of oil at RPM???
NOW buy keeping your high pressure down to 65 or 70 lb max you would be puting less oil to the heads and bearings so less windage and theroeticaly less oil up in the system. I run my engine at a max of about 70 lb but 60 is all you need.