You know...I see so many of these posts where a PB says, "It's all good!!" when in fact it isn't. I have decided that if I started a PB company and ran it the way it *should* be ran...I would be a very rich man.
55 is too much to start with. 35psi is what I do and i set it first thing in the morning when its cooler out. If it drops below 30 we have an issue it can climb to 40s easily with sun. 2moro it should be higher than the lowest reading you have seen otherwise it's a fail. Often the plumbing is fine amd the leaks are from hose bib valves or the test rig. I dont do them amd if I did it would be cut in after a pressure test. Also never use old school turn handles, either quarter turn ball valve bib or nothing. Rubber seals stink