Hm. Maybe it varies from snake to snake. But Ive had mine in a 20 gallon tank since she was very young as well. But also like I said she didnt feed for the first 3 months. Maybe theres a connection there? But in order to take up more space and make it more "homey" for her I built a hide made from bamboo and aquarium sealent that takes up nearly a third of that space. There are plenty of nooks inside so she can feel secure while small and enough space for her to grow into. I also added a set of climbing bars also made from bamboo. Those add not only a climbing element but provide some degree of cover as well. Her water dish and cool hide are fairly tall as well, and she likes to wedge herselve between them so even outside her hides she feels safe.(Im gonna brag a little now XD I also used square tiles of various sizes to moziac her name along the back side of her enclosure, solidifying a wall and providing a textured object to rub up against during shed should it be needed.)
But in closing of this long winded post, I really think cluttering will work wonders. The fastest way for the to destress is to feel safe and relax right?