I would try lining the inside of his hab with cardboard, for a week or two, to see if his behavior suddenly changes.
I don't consider that cruel. Rather, it's very important because he is no doubt slowly losing his home with you.
I agree with Brian's tip about meeting his aggression with strong control moves from you. Years ago whenever I had taken in an iguana who was totally committed to killing me, I would put on my kevlar gloves, sleeves, and a denim jacket, and reach in and grab it by the shoulder area ((you need to grab it close enough to it'd' head that it can't bend it's neck to bite the side of your hand. Also, as Brian said, some needed to have a towel thrown over them)), then immediately grab it's hips with the other hand, pull him out, press it to my belly, and waited for all the terrifying struggle to end. It never lasted for more than thirty seconds. Then while holding on tightly, walked to a sofa to sit down with him for fifteen minutes. During this time it would try to lunge away from my hands, but I learned to tighten my grip the instant I felt him start his lunge.
That describes the first taming move that I used on the crazy's. It can take a month or longer, but son your mean ig will stand freely on your thigh when you are sitting down. Then, taming methods are more stealthy and more gentle. You don't need to memorize all those moves right now. for now your ig needs you to use the bulldozer technique.
BTW, if you can't stop yourself from flinching, which builds up his confidence to the stratosphere, this taming move eliminates that problem.