I have a pressure regulator set at 50 psi for the motorhome which gives me acceptable water pressure for the shower etc. But, when I use the coaches water pump (water from the tank), the water pressure is considerably higher (the water almost peels my skin off ). Do I have the regulator set too low, or maybe the water pump is set too high. I have been told that 40 psi is safe for the plumbing, but the water flow is way too slow for a decent shower at that level. Maybe I could boost my pressure up to 60 or 70 psi?