First year with 4420 also. Ran ydrops. Here is what i did.. I put the drop on the front nozzle..Open the tp knob wide open.  not the aim nozzle. I unplugged every aim solenoid except the - outer two booms. Turn those off with switches if only going 60 ft. I removed my 5 big in-line filters, I ran 30 gals. I went Auto on the pump switch. I went to rate screen and hit auto there also. I ran 60-70 psi. In the bottom right side of main screen I changed the setting from AIM To PMW. Last thing was to change "Valve Cal #2 to 1976 from 1468. You need to change AB to 60 Ft configuration. Hope it helps.