I must have read it wrong, I apologize.
I just remember you asking about these snakes, and I just wanted to reiterate that they dont really have a "learning curve" like other snakes do. They need a pretty consistent environment to stay healthy.
82-84 is even a bit high in my opinion.
80-82 is what I would shoot for, all around the tank, yes. That means that the bottom of the tank should be 80-82, as well as the air inside the enclosure.
I will also say that the sooner you can get him out of a tank, the happier he and you will be. Tubs and reptile specific caging are much easier to maintain and give the snakes a better sense of security.
Whats the name of the breeder you got him from? Granted hes in Canada, I dont know ANYBODY who believes temps that high are good for Bloods. The highest I've heard of is MAYBE 90 for a gravid females basking spot until she lays, then the hot spot is dropped and its back to normal temps.
Even 78-80 all around the enclosure is fine.
Rather them be a bit cool and dry than too hot and too humid.
Also, did I see you were using Repti-Carpet? DITCH it, use newspaper. That stuff is a breeding ground for bacteria. Newspaper also simulates these snakes natural environment in the wild of hiding under leaf litter. Its cheap, and its clean as well.