A mixture of plant types is typically not the ideal scenario for flex daily since the core of the software uses the plant root zone depth to determine watering frequency and duration. If you look at the soil moisture chart for your zone it is showing your bucket being depleted, and it depletes at the same rate irregardless if you have different plant types.
If you think its close there are a couple ways to have it water more frequently.
You can go to advanced zone settings and adjust the crop coefficient up a bit (10%?) This will make the plants thirstier faster. You could also decrease the plant root zone depth which will also make the plants thirstier faster, but will also subtract some minutes since it is watering a little more frequently.
The great thing is that as you adjust these parameters you can look at the calendar or soil moisture graph and see immediate changes.
In future versions of our software we are going to make these adjustments simpler, but these will more than likely come after our big software release this year.
Hope this helps.