Well the temps look good to me. I personally have never actually checked the floor on the cool side of my cages. I keep all my cages with a 86-88F hot spot from flexwatt and the ambient is just room temp which varies from 77-79F. I wouldnt worry too much about the cool side floor temp. If the snake is never there and treats it like lava, then maybe look into adding a second heat tape set low on a t-stat.