I was checking a property today that has high pressure and decided to try and regulate it with the flow control on the master valve. First I took a reading (all dynamic) at a spray head near the higher elevation of the system, it was 72psi. Then took another station that was slightly smaller in gallons and lower in elevation, it was 80psi. With the gauge still connected I started to turn down the flow control on the master, all the time checking the pressure. I had to go down to where I was only about one turn from closed to make a reduction. The head that was 80 is now 50, and the head that was 72 is now 40. I didn't want to go any lower because I have two rotor sections. It seems to work, the valve wasn't hissing nor did it snap close. What are the concerns with this approach to reducing pressure?