This thread came as such a relief!
I just got my first ball python, and he's a spider. I had zero knowledge of their wobble, and began to get deeply anxious when he began doing it. So far he only wobbles when exploring a new area, such as extending his head if I'm holding him or if he's reaching the top of a container. He tips his head back and swings around to right himself again.
I was so worried that there was something deeply wrong with him, as all a friend could find when checking online for the cause was the "stargazing" related to IBD. However I'm now quite sure I just have a mildly wobbly little spider of my own.