Pump cycling

4 years a go i replaced my 1/2 hp shallow well ( 65 feet ) pump with a 3/4 hp ( it was only thing available on a Sunday evening.. I also replaced my expansion tank at the same time. Recently my bladder ruptured so i replaced the tank AND switch. New tank is a 44 gallon switch is a 30/60. My empty tank pressure was set to -2 llb's below the total pressure. Approx 37 psi according to the instructions. With that being said,,, my pump cycles with only a toilet flush. Could i have reversed the wires on the switch?

Help!

The air pressure with no water in the tank should be 1-2 psi less than the turn the pump on switch setting; 29-28 psi if you run 30/60.

Whoops, i made a typo... I meant to say 27 psi with the tank empty.

well, unless your toilet uses 15 gallons when it flushes... you got something else going on.

Is there a check valve on the inlet line to the tank?

I don't think there is a check valve..... I'll check tomorrow when i get home.