Don't you have a bunch of pewter stuff that's grown, like, crazy well?
I only have a handful of different morphs, but the ones I have more than one of, are pastels, black pastels, and normals (two boys) . . . It's one of the normals that is a spotty feeder. Always has been. He's not picky, he just has a very low feeding response and had to be assist-fed. The way he strikes a prey item still isn't quite right.
This particular group of snakes is also all related -- I wound up keeping my entire first clutch.
Behavioral traits certainly can be genetic, so I can see feeding response varying by family line and have no real problem with the idea that it can vary by morph. It's just, I've seen more instances that contradict the "morph=feeding response" hypothesis than in support of it.