Yeah, I think instead of switching back and forth, it's easier for me to just adjust the weekday schedule to eliminate the morning part-peak. I've set my off-peak through 11am weekdays and it charges the Powerwalls until that time, which seems to be enough to cover me over the rest of the day. I've actually also adjusted the evening so that peak extends through 11pm (forcing my house to use Powerwalls during part-peak).I'm just telling you that it works as expected on Balanced with our weekday rate schedule. Cost Saving works great on the weekends when there is no Part-Peak. But you can obviously do whatever you want...
High usage days might be different, but I also have the friendly weekend schedule to catch up on any charge deficit.
A side note: holidays are on weekend rate schedule. I wonder if the app considers that. I doubt it at this point; maybe I'll send in a request.