My adults have been very easy to handle so long as they're not stressed. When they're stressed (very rarely; I don't let things go that far), they'll give a warning strike.
It could be that the one you have was moved out because it doesn't handle well; breeders selling adults have a handful of reasons to do so, but not all those reasons are ones that would make someone want to buy the animal. Especially if the snake is coming into his prime, as you think he is.
It could be that the lack of movement and bad behavior is related. Perhaps the snake is uncomfortable because of the cage setup (or moisture levels, which the soaking and burrowing suggest), or because he has something internal that is bugging him.
I'd definitely consider the enclosure setup, which we'd need photos to help troubleshoot. Could be related to the use of a UTH, especially in an enclosure that allows for climbing -- could be that he's too cold overall. UTHs are good for tubs, and for species that need a warm spot but are otherwise pretty adaptable to temps (which BRBs aren't so much), but otherwise are pretty limited in usefulness.
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