Rb 26 Bearing Wide Clearance

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Hey ...am desperate for some professional advice on my rb26..

we assembled my moto with main and rod bearing at .0025 - 0028 ... we used standard bearing size and measured it properly. I know its wide but it still within in factory specs of max 0.0034..

I have a n1 pump with remix gears fitted .on start up am getting 78psi ...when the moto is warm am getting 30psi at idle... at around 5k reving am getting between 68psi ans 72 psi and the pressure will stay there..

The service manual says at 6000rpm u should have on average 66psi. so while am within factory specs am a honda driver and am accustomed seeing 90psi and rev to 9500...

Am using 20-50 none synthetic oil ..still in break in period.... I have tried to locate bearings to bring the clearances to at least 0.002 but am having a hard time..

I know its not all about psi ...but am not looking to race the moto just get it up to 400hp .. would the moto be ok with 70psi ..not looking to rev pass stock limiter either..

Am trying hard to aviod a expensive jun or tomi pump... would a lil thicker oil help?