Thanks so much for your response and your contributions here. I did actually change the DTH to yours and it seems to work, mostly. It doesn’t recognize the switch as being dimmable within ST app, for some reason, but it does report the dim level back to it. It looks like some of the custom settings (vacancy mode, etc; i have not tried them all) you enabled also work for the switch.
One issue I am noticing is that setting the “Default level” in the ST app results in different values in the “current states” for the device. Eg, if I set the “Default level” in the app to “0”, the ST Current states → defaultLevel shows “10”.
Just an FYI for others.