After reading over this thread, I thought up some questions.
1. Is there a malfunction in a specific area of the brain that causes the wobble? Or a malfunction in the balance organs? Some other malfunction? Might microscopic examination of the brain/head turn up whatever causes the malfunction? How might covering the eyes or plugging the labial pits affect wobbling?
2. If there were 20 generations of brother spider mated to sister spider and only the least wobbling spiders were selected to produce the next generation, could that make a difference in the amount of wobbling?
3. Could a vitamin/mineral supplement added to the parents' diet minimize wobble in spider babies?
Question 1 might be worth a doctoral dissertation. At 2 years per generation, question 2 is about a 40 year project. Question 3 might be the easiest to answer.