You are a brave man shooting 2x anamorphic hand held.... ;-)
Very nice framing, and I like the choice of color grading. I've only had the experience of one clip hand-held with the SLR Magic 2x adapter but on a GH4. It did show it's possible but not something I'd undertake for a lot of footage. I was surprised at how much distortion (curvature) there was in your footage, since my experience with a 50mm taking lens and other footage I have seen shows very little. Again, I was shooting on a GH4 where there is a crop factor, so perhaps that helped mitigate the distortion if it was there. Shooting with the combination on the GH5 is on the project list.
The one thing I find is of the utmost importance when shooting anamorphic, is keeping the horizontal plane of the camera as steady as possible. As you mention, minor motion on that axis leads to issues. It is a little less critical with 1.33x lenses, but still necessary.
Thanks for sharing.