New member & 1st question.

I'm thinking on installing a "Cycle Stop Valve" but need help on deciding which one to use. I've looked at the CSV1, CSV1W & CSV1Z.

I have a Myers submersible pump #2ST52-8, 1/2 hp, 230 volt, 8 GPM. This pump is about 125' down. I have no idea how deep the well is, but have never had a problem with water supply.

I also have a 20 Gal "Well-X-Trol tank with a Sq D pressure switch and is set to 20/40.

I would like to increase the pressure a little and maintain it. What CSV would be suitable for my setup? I would like to use the lowest price one if possible? Could any of the above CSVs work for me?