@davelr, I’ll review your schedules, but it sounds like we might be confusing schedule types and how they work.
On a Fixed schedule, If you alter the zone duration recommendation, your entire schedule going forward will update with the appropriate seasonal offset. In other words, Seasonal Shift will change your durations using your new duration time as a baseline. We make a relative change to the other months’ durations so that your watering schedule always matches the ET curve.
If you’re using a Flex Monthly schedule, the interval is the major variable that changes and minutes have a minor adjustment to account for rounding. Flex Monthly schedules apply Management Allowed Depletion principals to the entire schedule; whereas Flex Daily schedules apply Management Allowed Depletion principals on a zone by zone basis.
Relative to above, I believe we’re confusing schedule types and how seasonal shift works. Seasonal Shift is automatically enabled for Flex Monthly schedules and cannot be disabled. The feature can be disabled on Fixed schedules.
Seasonal Shift on Fixed schedules will change the watering duration to match the ET curve. On Flex Monthly schedules, the watering interval is changed on a monthly basis to match the ET curve.
Happy to review these recommendations from Denver water to your recommended schedules if you’d like to share or send them to us (support@rachio.com).
I’ll review your schedules in more detail to help clarify your Seasonal Shift questions.