Based on my limited personal experiences with my pair - I tend to agree with you. Although I also agree that Hog Island Boas are better called a "semi-dwarf" than an actual "dwarf". Since exceptionally large females are known to exceed 6.5 feet/2 meters in length.The only 'dwarf' Boa I have personally worked with is theHog Island Boa. These snakes generally have a great temperament, are good feeders and don't grow as large as the mainland variety.
I am not sure they could be considered as more arboreal - as even adult mainland imperators or constrictors can often found in trees in the wild. But based on wild reports, the dwarf and semi-dwarf localities do seem to be at least "as arboreal" as mainland imperators & constrictors.Are the dwarf Boas any more arboreal than BCC or BCI?