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Pressure is regulated by that hole. In normal state it is closed/blocked off. As pressure rises it forces the piston down, exposing the hole and lowering pressure.
More pressure, add shim between piston and spring.
Reduce pressure, cut down spring.
Both methods are going to be very small, fractional changes. Shim no larger than maybe 0.05". Consider the diameter of the hole and the distance in needs to move. Isn't much.
Same goes for cutting spring. cut less than you think you should. Maybe 1/4 coil. Need to measure assembled height and free height and make a judgement call.
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