I think you're going to have a very difficult time getting those questions answered. Breeders tend to not advertise genetic defects in the morphs that they work with, but rather use the opposite when they have good specimens (Kink-free caramel for sale!).

I believe the only one that is consistent are spiders in that supposedly they all have a wobble or can develop one to a certain extent.

As far as the others, some lines of Black Pastels and Cinnamons have much worse duckbills than others. I've produced some cinnamons that seem to have a slight duckbill, but I've also produced Silver Bullets and a Super Cinnamon that don't have any indication of a duckbill (from the same line). I have heard of some people producing Super Cinnamons/Black Pastels that were so malformed that they had to be euthanized.

The same thing with kinked Caramels. I'm not positive, but I believe that is another one that is line or even specimen dependent.