Ditto GOTTOYS' comment. I keep ours set at 45 psi.
From the RV Water Filter Store (rvwaterfilterstore.com): "RV plumbing systems are usually tested to a pressure of about 100 to125 pounds per square inch (psi), but to prevent warranty problems, RV manufacturers may recommend only 40-50 psi. Unfortunately, this may not provide the shower you're looking for. Most house plumbing operates at about 60psi, and this can be adequate for RVs, too. If your water supply pressure is approaching 100 psi, you are risking an expensive failure of your plumbing system. You should limit your pressure to 60-85 psi to be safe, and to do that, you can install a pressure regulator."
Remember that pressure is a static measurement as in when all the fixtures are turned off, what is the pressure the plumbing will stand? Flow seems to be your problem. Couple of things cause flow probs: the CG's water flow may be substandard especially when all the sites are fighting for the same water, cheap water supply hoses that easily collapse, dirty water filters, the water fixtures themselves have flow restrictors built in for water conservation. It may very well be your pressure regulator restricting your water flow.