Also, most breeders aren't breeding spider to spider since there is no super spider that we are aware of. Therefore, the spider gene is probably one of the most "out-bred" genes when it comes to morphs that have been around as long as the spider has been around.

In addition, many spiders (I hesitate saying most) don't have a significant wobble. They will slightly tilt their head or show more signs of wobble when they get excited, during feeding, etc. They seem to grow well, breed well and thrive.