hello. i am setting up our new RG700 sprayer. traditionally, 20 inch spacing is what people run around here. this machine has 15 inch spacing which creates some new learning. i am seriously considering the green leaf TDVR nozzles. does anyone here currently use these or any other variable rate nozzle? my target is 10gpa with speeds of 8-15mph, and sometimes up to 20gpa same speeds. online sales literature indicates these nozzles can handle my wishes. any real experience from anyone???? thanks!!!