To answer your question, yes the snake is evolved enough to be able to find the heat. Make sure that there is a cool side for the snake to be able to be fully off the heat and cool down. Everyone seems to lose their mind about ambient temps. IMO the temperature of the air four inches above the head of the snake doesn't matter. If the air at snake height, where the animal lives its entire life is the correct temps, and it has a hot spot and cool spot of appropriate temps, all is well.

In my racks some of my boas find their way under the paper towel and some don't. Just make sure that if the snake is flush with the plastic tub that its not too hot to burn, which it sounds that it isn't. 95 isn't going to burn.