Almost a year later and have a few questions.

[MrLang]

do lessers and pewters dull out too?

Yes - a lot of morphs do.

On the rat vs mouse thing, once they get to adulthood it is very common for them to decide to eat less. They have very slow metabolisms and simply don't need to eat a lot. The mice just dart around and move in a way that makes them irresistible to the feeding response - it doesn't necessarily mean your snake needs the nutrition.