From what I understand the difference between high and low pressure is supposed to be 20 psi. Why is that important, neccessary or whatever?

My switch is factory set at 20psi-40psi. I installed a small 2 gallon tank and set pressure with tank empty at 18 psi.

I set my high cut off pressure at about 48 to 50 psi. Is that a problem?

With it lower the pump cycles to much. I know I should probably get a larger tank, but with the pump in garage there is no room for a large tank.