I would provide more fake plants and sticks / branches to climb if possible...If you can get some plants to suction-cup to the upper parts of the tank, even better, as they like to hide higher in the cage.
If you can cover part of the screen lid to help hold more humidity in, that would be great, as well as blocking out some of the sides with paper (even, say, brown paper towels taped outside to cover the back / sides) that would help them feel more secure.
Over / under heating and dehydration seem to be the main killers with them that young / small.
If you do feed more insects as treats, please make sure they are gut loaded and dusted just like you would for a beardie or chameleon.
I own cresteds, gargs, and a leachie, but have never raised them from hatchlings. Several years ago I purchased a female from a breeder and he included a hatchling with her for free (about 2 grams). I kept him in a kritter keeper on paper towels and he died from dehydration even with once daily misting. The KK was too ventilated I think and the towels didn't hold enough moisture. By the time I realized there was a problem, it was too late. :/