I'd check the timing first. One thing you could do when it exhibits this problem is deactivate the ignition and try turning it over with no spark. If the problem still exists then it isn't timing related. I used to lose a lot of sleep over the oil pressure hovering around 15-20 lbs when hot at idle when I started building my race motors. After talking with others at my track and elesehwere over the years I don't even think twice about it any more. As long as the pressure comes up good at RPM I wouldn't worry about it.
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