It looks really really dry in there. With no live plants to hold in the humidity, the heat bulbs on top and how dry the coco fibre looks, I doubt that it is maintaining a 60% humidity. While waiting for the vines and plants (some branches would help too) cover 3 sides of the tank to help reduce that open feel and the stress. The big tank doesn't do much good if you do not utilize the height, which you have figured out. My tree frogs almost never touch the ground (usually only to get to the water feature or to catch a cricket that escaped the bowl.) The coco fiber should be damp and clump together when you squeeze it but not dripping. Unfortunately, there is no great humidity monitor, but those analogue ones are horrible. I use the nat geo digital one and it seems to be working well so far. I have an exo terra digital but it reads 99% all the time, so I wouldn't tend to recommend that one. I would also get some vitamins, I use repashy, there is a dusting schedule on here somewhere, my computer isn't working well enough to pull up a link for you at the moment. Crickets should be gutloaded and no bigger than the space between his eyes.