You got me thinking, so I went back and looked at my settings when I first set it up and found this post. Given this is my trees, but it should all relate.
Right now, my inches of water is 0.89 inch, so I put in my settings from before:
Gallons to apply: 5
Inches of Water: 0.85
Custom nozzle: 0.68
However, my custom nozzle since the beginning has been 1.70. So, the question is, what made 'Inches of Water' change? Is it based on temp? It seems all of my custom nozzles are now off which could explain my poor health across the yard.
I haven't changed my soil, however I did change my root depth to 5.