I will try to describe the Spider "wobbling." Some look like they have Parkinson's disease from the neck up, with the head shaking. Others exhibit drastic backward corkscreweing motions when trying to move. Maybe try looking up "Spider, BP, Spinning" etc. on YouTube? I know that someone posted a video showing the corkscrew motions.
My Spider never exhibited much of this stuff. He does sometimes have a head wobble when he gets ready to lunge for a rat; otherwise he moves as normally as my other snakes.