I do not have a boa myself, but from what I've heard their care (husbandry) is quite similar to a ball python's.
I am thinking you are having issues with the ambient temps because it is such a large tank, and glass. Getting a second heat lamp with the UTH (and thermostat of course) is a great idea I think, except you will definitely lose the humidity. However, I'm sure you know there are many ways to help with humidity, including humid hides and whatnot.
What type of thermometers are you using to measure?
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