loosing oil pressire on hard accel and at idle

First off, he said high pressure, not high volume. Two different animals. I think there are two seperate issues here. Whatever is causing the low PSI at idle is one issue.....possibly a cracked gallery plug or something of the sort and the high RPM loss is another issue. Maybe lack of a good oil pan baffle. Are you running a windage tray? Doesn't matter how good the oiling system is, if you got a boatload of low end torque, without a windage tray, you're fightin a losin battle trying to keep oil around the pickup.