similar problem with recently purchased home that sat for a year...
-3 1/2 bath
-90 psi at pump pressure guage
-cleaned contactors and pressure switch seems fine
-currantly no water heater, waiting for new one to arrive... possible contributing issue??
problem is no pressure (slight trickle) at shower heads only. Good pressure at all sinks, toilets
, 5 zone sprinkler
system, outside spickets, ... and master bath tub.
-Master Bath is the only stand alone bath tub, and pressure is great!
-kids baths-one shower/tub combo with no pressure at either
-one is walk in shower only with no pressure
I cant find any leaks
, and hot water leg is valved off(no heater), so I would expect higher cold water pressure if anything... but maybe not...