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it really depends on how much the piston has to travel before bypass i think.
if you look at my math previous, if the piston only had to travel 1" then it would be 25 + 2.5 psi or a 10% increase in pressure.
if two inches then a 5% increase. if three inches then 3.3% increase, etc.
a hard look at the inside of the oil pump cover shows that the piston travels quite a ways before bypass (as opposed to those by other companies that bypass immediately upon deflection).
but yeah, most of my thinking around preload had been in a suspension situation where the preload was against the static weight of the car (ie, adjusting a coilover for ride height) vs against a fixed surface. in the suspension situation the opposing preload force is already overcome by the weight of the car (unless your springs are so stiff that they don't deflect when the car is sitting on them) and the springs are operating in their linear range.
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