I've been listening to so many podcasts about these aerometers and reading a ton of stuff online and every discussion pretty much says it's a complicated mess that requires so many precise data points that precision is a challenge. One of the hardest things is finding the right course. On several pods, I've heard that while the Chung Method uses a loop, notio and aerotune work best on a windless 1k course (with appropriate runouts at either end). I want to jump in so bad I can taste it, but I'm nowhere near able to commit the time to learn it and get it right. Maybe if I had a tutor to speed the learning curve.
Hermes With the smaller Di2 front derailleur on the 9200, I'm leaning heavily towards 2x. I just have to wait to see what chainrings become available for that setup after it's released. Good thing is that my first TT won't be until the spring, and I might need all that time to find something.