just got a lesco skid sprayer and spent a little time this evening learning how to work it. Going to calibrate it tomorrow but put a 4 gpm nozzle on it and adjusted the pressure till I got it to go shoot 4 gpm, then put on a 2 gpm nozzle. Also got 4 gpm. All of this is pretty new to me, am I doing something wrong? Also to get the 4 gpm I had to run the pressure to about 180 psi. The manual said to adjust to 100 psi. Any and all advice/help is welcome.