Well 77F cool side is fine but if it drops 5F at night, then 72F might be a little on the cool side. Have you covered about 80% of the screen top to try and hold in some heat? Or insulate the bottom with a piece of 1/2" plywood or cover the sides with dark craft paper. You don't need a 80F cool side. I keep pretty much all my guys and gals around 78-79F on the cool side and depending on their preferences, 86-90F hot spot. I would bump the hot spot up about 3-5F though. And how are you checking the temps? With a temp gun or the floor directly? Not on top of the substrate as the snake will push substrate aside to get down to the heat.
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