Keep in mind that the videos you see on Youtube are almost always the most severe wobblers you'll find. I had never seen the wobble until I got my spider, and then I was curious so I looked it up as well. I was shocked by the corkscrewing I saw - Varys does nothing like that!

So that's essentially the worst case scenario, and it doesn't seem to be that common for it to be so severe.

http://www.owalreptiles.com/issues.php

That link describes a number of morph "issues", including bug eyes and duckbill.