While ambient temps are important, remember that your snakes dont hover and live suspended.
I'd say that substrate/floor temps are just as much, if not more important. You'd be surprised how much heat a UTH gives off.
I just checked my BP tank last night, I've got about 2 inches of eco-earth and then a light layer of reptibark, and an inch into the eco-earth is a good 105 degrees.
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