loosing oil pressire on hard accel and at idle

15 psi at a warm idle doesn't bother me with my 360. If its dropping on hard accel, then I'd be looking to find out why? High volume oil pumps require you to run every bit of oil that the pan will allow. We've found that most of the oil in the friend's 440, stays in the heads and will starve the lower end if not full. Lost a good race motor that way!
I've heard it's possible for the pickup to be too close to the bottom of the oil pan and pulling that rascal up.