I agree, the wobble has always been the worst thing in all of these new phones with the camera bump. However, I did solve this one way.
I used this "solve" for all of my S-Ultra phones and even on my Fold 7.
I bought a case with Mag-Fit, then I bought one of those rings and use it whenever I am not going to wirelessly charge (which is anywhere I go away from home).
View attachment 373023
(Picture is just an example of what I have)
When I have this installed when I am out and about, there is no longer any wobble.