Your numbers are exactly how mine behaves using 20W50 Valvoline racing oil. I've found that different viscocities of oil don't affect my pressure dramatically. Increasing my idle got me from 5 psi at idle to 20. (15 when very hot or getting off the freeway.)
As others have said before, that's fine. You could pull the engine, get in there and investigate, but there's really no need to.
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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