I agree with measuring the temperature of the glass not the substrate. They’ll burrow beneath the substrate or push it aside altogether. 97 is a bit high and the snake might avoid it. I like a hot spot of 88-90. I have a few snakes that primarily stay on the cool side of their enclosures, sometimes even after a meal. I say no cause for worry. As long as they have a good thermal gradient they’ll thermoregulate themselves as needed.