troubleshooting oil pressure

With 10W30 and the main brg clearance at .002" I would not be all that surprised at the hot pressures listed with the 2nd pump. How about seeing what it does with some 10W40....

75 psi pressure cold is plenty; be careful if you put in the stiffer spring; up near 100 psi or more, you run some small risk of blowing out the oil filter seal when cold. (Ask me how I know...). Or you can pump excess oil into the heads at sustained high RPM's....

If you find nothing, then run it a while, 'til the rings seal up good (probably done so already if you have loaded it up a bit) with 10W40, and then use 10W30 or 15W40 Mobil 1 and it will last forever.