Also something interesting to note, in terms of embryological development, both pigmentation and the neurological system develop from the neural crest. So, it's not that surprising that some morphs are linked with some neuro issues (spider, woma, champagne, powerball, super sable, etc). The neurological system is also very sensitive to heat, for example some temperature spikes during incubation, especially late incubation can cause hatchlings to have neuro issues. I incubate my eggs at a lower temperature and most of my spider combos have very limited neurological issues. However, this is just my own experiences and isn't based on any research or studies. It would be interesting to hear from those who have used a male Spider with really "bad wobble", incubated at a lower temperature and tracked the offspring to see if there's less issues.