I suddenly got this theory for the spider gene that came to me here in another thread. If the gene that makes a spider look like a spider and the gene that makes it wobble are both in an area (locus?) controlled by a "switch" gene and we're only working with that switch gene, then there's no way we could separate the spider gene from the wobble gene without manual manipulation of the genome.
And the wobble seems most like an inner ear thing, especially because of how it effects the snake in no other way. You'd think if it was neurological or muscular, they'd have more problems.
No matter what, long term inbreeding will eventually lead to problems. Prove it out, then outbreed as much as possible.
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