As Freakie_frog said, none. These phenotypes (morphs) are the result of genetic MUTATIONS. These mutations will carry certain flaws with them on occasion (the wobble in spiders). It just goes with the territory. You will not successfully breed the wobble out of the spider. The wobble is attached to the spider gene. If the spider gene is present, the wobble is there. Kinks can happen with any morph due to environmental factors but they are also linked with certain genetic mutations.

You cannot teach a gene how to behave! A gene is like an instruction manual for a certain trait. When a snake inherits the spider gene that gene tells it to display a certain pattern and color AND it will cause the wobbling affect. You can't escape it. Sure there are varying degrees of the wobble, but that is not affected by the gene itself. It is random. A high wobble spider can produce low wobble offspring and the other way around.

Inbreeding is a useful tool to produce desired traits in snakes. You will not cause defects from breeding related animals. It CAN AND WILL happen if you line breed which is continuously breeding closer and closer related animals, but occasional inbreeding is not a problem and doesn't need to be avoided. Yes, genetic diversity is good but that does not mean no one should inbreed their snakes. Many breeders on here will say they inbreed their snakes but will not line breed. This does not make them bad breeders.