Bearing wall thicknesswill tell you what came out of the engine,won't necessarly tell you the correct size to put in, wear etc.
The measurement you provide tell us that it WAS ASSEMBLED with .010 under bearings. Standard wall tickness for rod insert shell is .0621, you have .067; 005 more x 2 shells is .010 under. Main shell std. is .0955, do the math, .010 under. Should measure crank for the correct figures but it seems that you probbaly have at least .010 bearing clearance, hence the major factor in your low oil pressure.