I would leave depletion at 50% and the only variable I would really touch (unless your root zone is wayoff) is crop coefficient. It will not affect watering duration, just watering frequency. The higher the coefficient, the closer to full evapotranspiration you will use, which pulls your moisture level down faster, which will make you water more frequently. If you want to adjust the watering durations I would just change the minutes directly. They system works really well when dialed in.
This documentation might help. If you don’t want to spend the time dialing all this in, flexible monthly might be a nice month-to-month predictable option for you.
