Ok, 2 things, on your advanced zone settings, make sure your available water is .1-.12.
I,have sandy loam in 2 zones and .1 is my sweet spot (turf has been top dressed 6 times).
Second, which zone(s) is drought stressed? If it is misters, it is possible that the pressure is low on the valve so you are not actually getting the 2 inches per hour. It is also possible that the head on the misters is a much lower flow. A catch cup test really needs to be performed on the stressed zone.
Here is what I recommend for the short term till you can get a catch cup test, the zone that is getting hot, create a custom head and set the pr to .75 of what that zones pr is currently set to, match the actual head type.
I'm not trying to be an ass, but, there is the type of irrigation installer that is completely anactdotal and says run the zone for x minutes. There is also the irrigation installer that says, your system is designed to percipitate x inch per hour. The difference is that the latter installer has verified pressure at the end of the rail, so we are dealing with a known quantity, we need a catch cup test so we know that quantity.
If anything I have said is cryptic, let us know, somebody or I'll,will clarify...