Well what days can you water, I would suggest starting off with watering on the days you can for 10 minutes each zone early in the morning like 2 AM then water for another 10 minutes just before where you are not supposed to water, where I am in Colorado I believe it is 9 AM so I run my front zones for 10 minutes each at 8:30 AM then water again close to midnight so that there is some residual moisture for your non watering day. See if the water is running off the lawn or not. If the water is running off cut the watering length and split the time between 2 more times. Mow the lawn as high as possible tall grass keeps the lawn cooler. Lawns need water you and only you can figure out just where the sweet spot is for watering. You also need to make sure your heads are watering evenly by putting out some shallow trays, pans or whatever something you can see water in and place them around then water and see how full they get.
To the value of the Rachio is adjusting and tweaking the schedule that works not determining the schedule that works. OH and if you find mushrooms growing that spot is probably getting too much water.