Very good but I'm surprised that there was so little differential on a new switch. You do have the switch on a tank? Yeah you mentioned a bladder. The tank sounds waterlogged.
I replaced it where it was originally installed, on the side of the pump which is in very close proximity to the tank. New switch was a 30/50. I recall most of the ones I replaced were on the tanks and the pumps were larger and submersible. Most were 220/240 V. The one up here is a 110/120 1 hp. I actually think this might be the first above ground pump I’ve ever dealt with other than wiring in the electric for a hot tub one time. I think you are probably right about the waterlogged bladder. That’ll come up somewhere down the line.
