With my snakes I go through hell the first 2 weeks after I get them. I leave them alone. They come in, go through a de-miting procedure (wiped with De Flea then water) get pictures taken of them, handled for a bit to gauge their stressed attitude, then they are put in their tub, and left alone. It kills me every time, it is just so hard to do. 2 weeks of being left alone, then they are offered food, then left alone, following week offered food, left alone, offered food the next week. If they ate all 3 times, then I start handling them for no more than 15 minutes every 2 days, then 15 minutes every day if they eat for another 2 weeks.

That's my procedure and it works for me. Just know that I have had snakes that struck prey on the second week, and ones that didnt eat until the fourth week.

Your hot side, as has been said, needs to drop down to 90. Block off 3 sides with something (I wouldnt block off all 4 as the sheet may be because lifting that sheet may be a little shock to him).