Here's what I would do. Fix that boom so the nozzles are spaced 20". Drop the height to 16". Run AI11004 nozzles at 40 PSI and 5 MPH. That will get you a fairly low drift spray pattern that covers well applying about 20 gallons per acre. The AI nozzles of course, are air inducted. As an aside, the weather has changed drastically in my state. It is now extremely windy the majority of the time here. Now all of my spray tips are air inducted. Even the disc-core nozzles I use to spray shrubs and flowers.