Eating behavior changed

[Malum Argenteum]

I've always read (and my experience has supported it) that having a routine for feeding is a good thing to set expectations,

That's a reasonable idea, and can have some practical benefit. Another approach, though, is to read the snake's cues so to know when and how the snake is ready to eat, and feed him then and in that manner. This is roughly exactly the opposite approach -- instead of training the snake, it involves training the keeper -- but I personally think it is the better approach, or at any rate is worth considering.