Low oil pressure when hot

Thank You 70aar that was my thought but I just wanted someone with more experience to confirm it. also yes I have a HV pump and also a 10 qt pan and have opened up the drain back holes from the heads and lifter valley so I'm not pumping pan dry. Cold pressures are 50 idle 1200rpm to 75 at 4000. hot are 10psi idle and 40 at 4k. I will pull the intake and see how close the "waistband" is to being exposed at full lift and try to calculate where its at on the base. but I will get some solid bore lifters just to be safe.