Hello,
I don't think you needed the pressure switch with the lever. I would get one without personally. Is the tank the same small size?
The test I would do is when you are at 50psi wanting the pump to build to 60psi, close the main shutoff valve so we know everything is off. Have you tried this? It holding 50psi makes me think water is still flowing through the CSV and it is holding 50psi.
The pressure dropping to 20psi after you manually turn pump off makes me think water is going somewhere too or it would stay at 50psi then.
I wouldn't adjust the CSV. The settings do not change if they worked before. If you see leakage from the CSV at all let me know...
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