I've gained a lot of valuable information from these forums, but recently I realized I haven’t contributed much myself.
This is partly due to limited time, but also, to be honest, because I often find others here to be far more knowledgeable...
I touched on some of the issues you've run into in this thread:
https://mavicpilots.com/threads/how-to-take-a-vertical-panorama.153229/
Going lower will only make things worse.
Using a planar projection will help with better stitching to show a...
AutoPano Pro was considered the reference standard since ~2005 to stitch panos. $100 back then &
worth every penny. Just point it to a directory & it will find all
panos available to stitch together. Many perspective & rendering
options. Good GPU...