Imported Gonyosoma very often start off very well in captivity then crash at an alarming rate! If not done already, a rigorous deparasitizing regimen must be done. They come in with a huge parasite load. I would raise your temps a bit to 84F and get an arboreal set-up going so you can have various temp. gradients available for the snakes to choose.

I have mine in BARRS (Herpcages.com) 24" cubes with hides up high near the heat panel and on the ground. Cages are heavily decorated with fake greenery and have multiple perches. I mist every three days here in Vegas as humidity consistency is a constant battle.

Mine constantly rotate from inside the arboreal hide (warm) to on top of the hide directly under the panel (very warm) to soaking in the water bowl on the ground floor....this is usually after feeding. They are a shy snake by nature and benefit from hides and the camouflage achieved by the heavy fake plants in the cage.

Bill