I think you've got it. Nice looking focuser BTW. About having gone through the learning curve to knowing your CFZ size, it's going to help you down the road.
FWIW, I highly recommend you begin logging your autofocus results (you'll need to turn on verbose focus logging for that). This will begin to create a record of temperature versus focus position (plus some altitude residual information) for your gear. You only have 50 steps in good seeing to stay in the CFZ. Getting a feel for where you normally reach focus and how much it changes (in steps) is a good step towards knowing how often you need to autofocus. Autofocus has some definite quirks, and these are being at least partially addressed by Adaptive Focus Control (temperature and altitude focus compensation). That feature when released will automatically analyze your historical data and add some sophistication and efficiency to focus management. Wasting open-shutter time on AF runs isn't where most of us want to be spending time.