Your pr for the zone should be .3, don’t change that, the model will skew, this skew will continue to compound.
What I’m trying to tell you is that, your irrigation must run that long based on the data you have presented. You can sacrifice root qualit by shorter more frequent applications by artificially inflating your pr, but this is rarely desirable.
Take a,look at this guys post, he has pics of doing it wrong to doing it right, all on flex daily, living in satans butt crack Watering strategies to fix this bad area