I have tried allsorts to make the fsc better but in the end found a dodgy valve in the pump - I could'nt really better the original for a best compromise. It does work so much better when I went to 21l/m from the 15l/m
It makes a little difference in the angle of the spray as they are quite close to the ground BUT the orientation of the nozzle to the spray arm does make a difference. The nozzle effectiveness increases if placed at 90 degrees to the arm but coverage increases if placed in line with the arm. I turn one in line and one at 90 on stubborn drives and walk slower. DS will probably need someone else to explain :