I think the spider wobble resulted from too much inbreeding of the spider gene. and thats why it is a problem only with the spider gene, so outbreeding the spider gene into other morphs in my opinion should reduce it, however I think that further inbreeding of the spider gene will only exponentially increase the amount of 'wobble' that is expressed. I have not seen the wobble too bad in too many spiders being sold recently tho, which I think is good. My spider doesnt wobble at all, atleast not that I've noticed.
It's been pretty well documented that this is not the case, and that the presence of the spider trait is the only factor in spider wobbling.
If it was a case of inbreeding, then the "normal" siblings to spiders would also wobble.