Thanks for chiming in.The CSV pressure setting will be mostly determined by the capability of the pump and the size of the pressure tank chosen.
Since you will be pumping from a cistern, there will not be much vertical lift so the submersible pump should be capable of exceeding 70 psi. If using the standard 4.5 gallon pressure tank, if it were me, I would use a 50/70 pressure switch so the CSV will provide 60 psi constant.
I suspect going from our current ebb and flow of 30/50 setup with 82 gallon rated pressure tank, that 60PSI on a CSV will seem like heaven.
Just wasn't certain of what to choose...THANKS.