" But I'd consider looking to swap to a pvc cage so you can keep temps and humidity much easier than fighting with heat lamps and wet substrate."
+1.
I defer to all you folks on all things BP, but I will mention that I currently have a yearling rainbow boa that won't eat unless I keep it in a shoebox (which is way too small). I've tried to bump up the enclosure size (slightly) twice now, and same results. Some snakes have a funny idea of how large their enclosure should be. (Not saying you should keep it in the small tank, just commiserating).