good cal brett. I agree.
but seriously why do you need need a high pressure oil pump. the only need for that is a motor with extremely high seat pressure valvespring running a hydraulic camshaft. high volume would be better than high pressure but niether are necessary unless yopu have an extremely modified motor (tolerance wise) not bolt ons.
id recamend a vacuum pump setup and just use “breather” like other have said, and do believe the problem stems with the hp pump but is noticed after the camshaft swap do to thne extra “aeration” created by the lifters having to travel more in the lifter bore and oil galley. causing extra crank case pressures.