Im not sure what you mean by this is your problem. The mains are a little loose now IMO and .001 undersized bearings are in the works but this is a race motor. Rods seem spot on for the crank pin diam.

Also, based on the oil schematic for the Gen 1 block, the cam bearings get oil first. I understand what your saying as a whole system. Also, I tried 10-30, 10-40 as well and no difference in oil pressure.