That's about the most detailed husbandry description I've ever seen--great job! Now to discuss a few issues . . .
First of all, moving is extremely stressful for a snake. Add handling for 30 min a day by a new Godzilla--that's you--and you have one
very stressed snake. For the next week, just leave him alone.
Don't handle him at all, don't try to feed him. Change the water daily and spot clean as needed, but don't do anything else except:
Buy some long-fiber sphagnum moss (orchid moss is cheaper than that sold for reptiles). Dump the water out of your humidity box. Soak the sphagnum moss in some water, then squeeze it out until it is just damp, not dripping. Put that in the humidity hide. That way he can stay hydrated without being forced to soak.
You can also buy a spray bottle & mist 3-4 times a day to keep the humidity up in the enclosure. Glad to hear you're buying digital thermometer & hygrometer--they are much better than the stick-on types. I too used stick-on types until I learned better--I've never removed them from my BP's enclosure because he likes to hang on them!
He does not appear to be going into a shed cycle to me, but do you know when he last shed?
The main problem is most likely stress. Just let him chill for a week. Watch for him to come out and explore and hunt, then try feeding him. Don't handle before feeding, just try feeding. The least amount of stress when you're trying to feed, the better. Also, don't handle him after he finally eats, as some BPs will regurgitate their meal if they are handled within 24 hours of eating. Once he does eat, you won't see much of him for 2-3 days, most likely; don't worry.
Later, after we get the feeding issue resolved, I'll suggest a different climbing piece, but let's not worry about that now. Good luck!