Without claiming to be revolutionary, I simply wanted to share some settings that could, according to your preferences, improve the immersion and the satisfying feeling of the game in the 3rd person (obviously outside the original creations and adjustments created by Modders).

I find that the feeling of the game is more pleasant by setting in the graphics options:

The field of vision to a value of: 65
as well as in the options, Game tab:
Intensity of the camera oscillation: between 40 and 80

The game in the 3rd person becomes more fluid and reduces (a little) the feeling of floating and inertia. The jumps still do not offer a realistic feeling, but it is the best I could find so far.

If you have other ideas for settings or advice to improve the feeling and imersity in the 3rd person, I am sure that all of us roleplayers would like to know your personal recipes!

In the meantime, I wish you all a good time in the game!