I used TS Model Factory and TS Forecast Factory for the first time, so again I got to know some new tools. I also implemented a solution for ETS using a batch macro.
I used the TS Factory macros off the gallery as they were ~ 10x faster than the batch macro I made (below). I also saw that ARIMA had a lower AICC, but followed the post 2018.2 orders 🙂
Solution attached. My numbers are slightly different. Don't know if it's a change in tools or I missed something. I couldn't get the 2018-2 solution to run so I can't see exactly what was done there. This is one I'm planning on coming back to.