I agree, tighter more enclosed hides and no visible light. He also may be simply hungry-what's he eating and how often? How are you judging temps-do you have a temp gun to double check any thermometers in the cage? Is the heating only from bulbs or do you have a heat mat also? Given you've only had him a month I would cover up the sides too, give him some privacy, I had a boa that struck at the cage door a few times in the weeks after I added him but once he settled in has been fine.