the 360 i pulled out would idle at about 12psi hot with 20w50

now my fresh 440 with a high volume pump gets about 8psi hot idle with brad penn 10w30

the engine is all new and assembled by a machine shop, clevite bearings melling high volume pump ect. on cold startup its at about 75psi. then it gradually drops as it warms up. the oil pressure is responsive as it should be to engine RPM. when hot it goes up to 50psi at most

any ideas?