Hi,
I think part of the problem was this is posted in a ball python section instead of the boa section.
So, different animal behaviour in terms of climbing, security needs and temperatures.
When I hear exo-terra I picture a taller than it is long enclosure - in which case the temps needed to get the hot end hide right for a bp at ground level would be dangerous at the top of the enclosure.
Hence the replies about the heat gradient on the bottom of the enclosure.
del