IF you want behavioral advice, then put on your behavior thinking cap.
Snakes live by scent. They scent mark their range, their hiding areas, their trails, all things theirs.
They do so to identify what is THEIRS. When switching cages, its only you who have thoughts of this and that, you know, to big, to small, to whatever. You ignore what the snake was thinking. Did it ask to be moved to another cage? by bet is no.
So all you did was take away everything that belonged to that snake. My bet is, its trying to go back to where it was. Back to the area and things that belonged to it(its called being territorial) It wants it territory.
I know, your offering what its going to need. And eventually it will need it. The problem is, the snake does not want what your giving it.
The solution is simple, trick the snake. Snakes are so darn easy to trick. When you moved the snake, if you would have used its old hide, its only substrate, something or everything in its old cage. Then you would not have a problem. I, as a matter of practice, always move something from an old cage to the new cage. I did/do this to prevent a hesitation in growth. It was my experience that when moving snakes to a new cage, you lost a month of growth, even when the snake acted normally and did not protest.
Have you ever noticed that right after cleaning your cages, the snakes crapped right smack in the middle of the cage, and did not right away? ever wonder why? Don't they want a clean cage?
The answer is, they are like you, they want the "their" cage to smell like "their" cage. Not like something else or some others cage.
Sir, that is their nature(behavior) that is why they have forked tongues and scent glands.
In many cases you may not notice the protest, but it always occurs, sometimes if more pronounced at certain times of the year. Like now. In the fall, they behaviorally move to a small safer home area, in the fall, its very important they get this right. In the spring, or summer, its not as important as they are increasing the size of their range.(depends on species). Cheers