their flow drops as pressure increases. perfect example without getting over-complicated and explaining beyond that
so i was thinking about this, and i've figured out why it's wrong. flow drops as pressure increases is right, for air compressors. however, mass stays the same (or at least damn close). since air is compressible, the volumetric flow drops, but the mass flow should stay constant, within reason. thats why i don't see why shimming the oil pump to run at a higher pressure would cause a flow decrease in an incompressible fluid, such as oil.
rebuttal is welcome