I wouldn't worry at all, just let him rest & "settle in" to his new home. Sounds like he's still digesting his previous meal anyway, & if he still has a visible lump from that meal, it was probably on the large side, & I would not have offered more food just yet.
Over the years, I've noticed that some snakes (after having a meal that was a bit too large) seem to prefer the cool side, which seems counter-intuitive to what you'd expect. I have a feeling that snakes may instinctively try to keep from digesting a larger meal too quickly, so as not to overwhelm their digestive tract or because the nutrients would be poorly absorbed? or perhaps it's because their digestive enzymes are limited? But I've seen this "movie" before...whatever their reasons, I think we need to trust our snakes to know what they need.![]()