Hey mate, good news. Just im a quick tip - a user posted about bumping up humidity - this will help him with his shed, because it would losen up and be a lot easier to get off, you said he was trying to get it off to, it may come off by him doing it. you can put a extra water bowl in the hot end to bump the humidity up for a few days, and soak it again and dab it/wipe it with a damp cloth and it should come off. just a quick note - he is probably so calm with you because it's cold lol as soon as it's back to normal it won't be long till he tags ya out of love haha.
and another thing in my opinion - if you use boiling water out of the kettle, be careful not to cook the rodent and it could split, I use hot tape water and let it sit for 10-15mins and it full thaws out and still is offered hot. don't worry about boil water because when they are frozen the bacteria/parasites get killed anyway. I myself personally don't bother with a feeding tub because I don't believe it makes a difference to the snake and I don't like to handle my python after a feed at all. if you think about it this way, you want to feed it in another tub so each time you go to get out the python it doesn't think you are food right? but what about when you grab the python out then feed - wouldn't each time you grab him out he thinks it's feed? i donno if i'm making sense but i'm half asleep lol. either way I don't believe it makes a difference