And this was posted in 2011:

All spiders wobble. It could be as miniscule as the head tilting just a tiny bit to severe corkscrewing but they all do wobble. I have a few spiders and have seen a lot more and every one of them wobbles. Even the combos wobble. It comes with having a spider. Some people will not have them due to the wobble but I personally think that if it doesn't inhibit the snakes ability to live then there is no real problem with it.
He says he has "a few" spiders. Generally "a few" means less than 10, let alone 30.