I keep my BP about 78-80F cool side and 86-88F hot side. I would have to check literature, but 86-88F is more than enough to facilitate digestion, especially if you are feeding appropriate size meals.
My BP is an albino and spider morph and spider's are prone to neurological issues. That's party why I keep her a little cooler, but I do not see how it would have a negative impact on any other BP. She spends 80% of her time on the cool side on in the middle (where it is about 82-84F).
I would want your cool side a little cooler than 82F.
If you have to lower the hot side a little to achieve 80F cool side, it's probably worth it.
I have to ask, but are you checking the ground temps with an IR temp gun?