is it more pronounced if the cross is spider x spider?

or how about if you cross a normal with a spider, will that reduce the likelyhood of the babies displaying these characteristics, or at least reducing the wobble.

I know it doesn't really affect the snake much since they can still eat, crap and reproduce. but I would think most people would try not to perpetuate a genetic defect if they can.

Then again, I've seen what kinds of dogs some breeders produce that, to me would be an evolutionary dead end. Pigeon breeders have used selective breeding to reproduce some truly bizarre looking birds. birds that only fly in loop-de-loops, some that can't fly at all.