Correct me if I'm wrong because I'm still learning genetics, but to try for a Killer Clown you have to breed a pastel het for clown to a clown right? If I'm not mistaken the Clown is recessive and you need both genes, one from each parent?
From the breeding pair above you would have a possible outcome to hatch out a pastel clown, but a killer clown (super pastel clown) would need at a minimum breeding a pastel het clown X pastel het clown.
Specializing in Ball Pythons, New Caledonian Geckos, and African Fat Tails