I am no expert here but I do not believe any of those deformataions have been proven genetic...
Also, in the case of spiders head wobbles and the duck bill in super black pastels and super cinnies, it is a deformation that comes with the morph... What ever gives them their pattern also gives them the deformation... Spider sibs and sibs from the super cinnies and black pastels do not display these deformations...
You are a bit off track with your examples...
Most reptile species can handle many generations of inbreeding with no issues at all...