low oil pressure between builds

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hey guys am really confused whats going on with my build..would appreciate it if you guys took a min to read and help

i bought a rb26 moto that came with a damage oil pump.... i changed the oil pump and installed a new n1 crank also ....i also replaced the bearing with std acl ones .the builder said he checked the clearance and they were on target around .0015 ..on start up of that moto we got a average of 82 psi ....we dynoed the moto and at 300rwhp the rings cracked ..i noted that the oil pressure was a lil low on the dyno but i cant remember the exact number


when we took down the moto we saw that there were scratches on the cylinder walls and decided to use another block we had access to as we had already went ahead and bought forge std pistons..we basically switched the the block and the girdle only..we use the old oil pump ,water pump, crank ect....we measure the crank journals and it was in specs....we also noted some scores on the old bearing that suggested low oil pressure or clearance to close....the crank also had a lil score on the journals but the builder said his experience that damage was small and shouldn't be a problem

we measured the clearance in the new block and it was wide with std acl bearing....0025 of the max .0034 .. we consulted with some guys who build drag racing rb26 and they said it was a lil wide for a street car but they used similar specs on there drag cars that goes 8sec in the quarter..

now when we started the new moto we got back the same 80psi oil pressure... but the problem comes when the car gets up to temp i see only 60 psi at 5k and ad we go up to 6k it backs off to 52 psi as if the pump is running out of steam...

i then changed the oil pump and to a new n1 and replaced the gears with reimax gears for safety ..on start up the psi is the same and i still have the same low psi behaviour at high rpm.
i used 20-50 oil in both builds also..royal purple


i also changed the little o-ring by the oil filter on the block to ensure that pressure was not dropping off their ..i also looked at the pick up and it was clear ..but i also noted that the builder used silicone instead of the o-ring between the block and the pick up with a gasket

my question is why am i getting these strange oil pressure behaviour between builds with the .0015 clearance and .0025?? .am aware the wider clearance suffer from lil less oil pressure ,
also is the n1 pump capable of delivering enough oil with the wide clearance ,,,?? i know that i should be getting 100 psi at start up with the n1...

what else on the engine could be responsible for leaking or lowering the psi .? could the oring by the pick up cause this much difference?

am really out of answers and ideas ...please help....