Ideally, you should have 2 small, identical hides, one for each side of the enclosure. If the snake prefers one over the other, then they will have to choose between security and proper thermoregulation, neither of which is healthy.

Plastic plant saucers(little bowls that catch water under the planter) are great hides as they are low to the ground and hug the snakes on every side. You can cut a hole in the side of two of them and put one on each side.

Are you measuring your temperatures with a digital thermometer? What are they currently?