Maybe just to add to all the possible causes of such problems might be the simple fact that in natural accurences, reptiles usually have many babies and only a few survive to breeding hood.. this automatically gets rid of the week ones..
In captivity .. even the runt or the weak one will often pull through and be alound to genetically reproduce...
I personally think there is many factors that can lead to many of the above enlisted problems.. its not just inbreeding
just my 2 cents as well
1.3 Coastals 6.6 Jungles
3.4 West Papuan 1.0 Bred'ls
1.1 Yellow condas 0.1 Sebea
**looking for female Bredl's python**