Hey @MrWarski. This is how I set up my trees that are on drip.
Look through the Water-Use-Wisely info. to see their comments about drip and how the amount of water delivered might relate to canopy size. You might need to do some research on your specific trees and how much water they require. Since they are growing, you'll also want to make adjustments as they mature.
That precipitation rate you use seems quite high to me. It's great that you measure the output, but keep in mind that the output into a pan would be very uniform, but as it drips slowly into soil there will be much more vertical displacement under each emitter and less the further away you go from the head. That's what makes setting up inches per hour tough for drip, and why I came up with a way to do it based on a total number of gallons delivered per watering. I hope this helps rather than confusing the matter!