I think the more room the better as long as it's usable space for the snake. You are right they don't like open spaces but a large enclosure with lots of things to explore will keep your snakes actively exploring their home.
She seems to be settling in
She's almost always on the move. I have a container with coco fiber in it and some cuttings of pothos, and she loves to dig through it.
This enclosure is definitely working out