I have approx 1 year old Sonoran desert boa, he is super sweet and easy to handle but never ever shows himself. He is always in the same back corner of the enclosure coiled up except when I bring out food. Not sure if other people have more active snakes, be nice if he actually used his enclosure or displayed a bit. Anything I’m doing wrong?

It’s a pvc tank about 3x2 feet. Ceramic heat emitter. It’s about 85 on warm side and 80 on cool side. There is a heat pad with a hot spot of 90. He only ever uses the hot side of the enclosure. Never ever see him where the heat pad is. Here is a picture. Any suggestions? Is this normal?