Been watching with interest since I had my own oil pressure adventure a few years ago.
I've learned to check oil pressure gauges against a known calibrated gauge using air pressure before installing them. I've found that nice electric gauges can still be off a good bit, but even the cheaper mechanicals tend to be pretty accurate. You should be able to trust your new gauge.
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Driving at 3000 RPM fully warmed up at 205* and I'm at about 42-38 PSI.
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This is still lower than I would like, but if you are at 205 deg during a sustained high RPM run then it would not surprise me. If you can get it cooling better so that it runs 180-190 then the pressures will probably be higher. Same for pressure at idle especially after a hard steady run.
But dropping pressure at high RPMs is not good. I've seen see that on some of my cars during sustained right hand turns- like dogging it around an interstate loop with a stick in 2nd gear, obviously caused by uncovering the pickup. I don't think that should happen in a straight line if you have enough oil in it though.