We have a 3 bedroom house with 2 baths, the well is a 4" submersible 1 hp motor about 75 ft down in the ground it has a storage tank of 75 gallons. there is 1" PVC running up to the house...the problem is the house only has about 20-25 Psi. on each faucet inside or outside the house...the pressure guage on the side of the storage tank reads about 30psi at the same time, according to the guage on the storage tank the pump turns on at 25 psi. and turns off about 35psi. arent they supposed to turn on at 40 psi and off at 60 psi ?? can i adjust the pressure switch to fix my problem ?? thanks for all the help