Hello, I live about 800 feet from the water meeter and when they ran the line to my house they ran a 1" pvc. I live on a down hill slope and I have 65psi at the house hose bibs. I can get it up to 110psi if I adjust the pressure valve and get super pressure but still drops considerably when two things are on at once.( I was told leaving it at that high of psi would eventually damage the plumbing, pvc pipes, etc.) My problem is that I can never have more that one thing running at a time or the water just barely comes out. House was ran with 3/4" cooper main runs and branched off with 1/2" cooper. Thank You

1" running 800ft. is not so good, but you did say you were downhill. You can run higher pressure but Volume is the limitation since the limiting factor is the 3/4" line from the regulator. Are you sure there is no debris in any of the faucets? Pull out the aerators and see what kind of flow you get.

Yes, your pressure is too high, should be about 45 psi but your volume is low. You may be allowed to add a booster pump but the improvement will be marginal.

I suggest installing a well tank and setting PRV to 60 lbs. Installation of a 100 gallon bladder tank should give you about 50 gallons of water storage at 60 lbs. of pressure, ready for your use at any given time. As soon as you begin using water the pressure will begin to drop and additional water will enter that tank but not at the same volume as you are using it. At some point (when the tank is empty) the volume of water flow and pressure will drop back to where it is now. That will be 50+ gallons from the time you open the first faucet.