I'm having the same problem, and the Litchi Forum on Facebook has multiple users with the same problem. Looking forward to the answer you get from Litchi, but maybe we all need drop them a line. I'm going to send them an email now.
I don't know exactly where I saw it, but it was from DJI and they said that they DO have a Mavic mounting adapter coming soon for the CrystalSky monitors. They already have the adapter for the other transmitters. Obviously it would need to be smaller for the Mavic controller. Even if they...
Regarding your RTH accuracy issue in 5- Check to see that precision landing is still enabled. That is one of the things that updating turns off on mine. Thanks for the report. I'm going to try fixed wing mode today.