Hey @C_Hobbs this is really good work.
I developed something that is essentially the same thing. One thing that i noticed is that you only have open and close. I adapted the code to also map a dimmer slider (0-99) to servo (0-180). This allows control through full range of the servo. I specifically use this for partial closes. Also I have set a lux sensor and close the blinds incrementally from 4 hours before sunset to 45 minutes before sunset. This limits the light and heat coming in during peak sunlight on my windows. The blinds follow the sun with this, but still allow the view out the back of the house except for the last phase of the incremental close.
I hope this is good info. Oh and there is a 3d print servo mount over on my github that lets it sit perfect in the tray. Let me know of any questions. Again great work, I really love the price of these. I had thought about grabbing a few nodemcu devices, but I didn’t have any windows left.