loosing oil pressire on hard accel and at idle

Lets start with the pan Kevin, has it got acceleration and decel baffles in it and what is the large number stamped into the bottom of the pan also are you using a windage tray. I'd drop the pan because you also need to check how close the pickup is to the bottom of the pan. 15#'s at hot idle is way to low for a HV pump and are you using a reliable mechanical guage when you list the pressure.