Sounds good, so far, Zero....
His cage is fine for now, size wise. Does he have lots of foliage to hide in? What is your hydration/misting schedule? Does he have a dripper? Do you actually SEE him drink? His humidity should be around 50-60% most of the time. What kind of UVB lighting/basking bulbs do you use? Do you gut load his prey and provide weekly Calcium D3 and vitamin supplementation?
I see his usual diet is anywhere from 8-10 medium to large silkworms, and 5-6 crickets per day. At his age I truly don't believe he should be eating anything but small-medium feeders. 1 large silkie is equivalent to 3.5 crickets. That's alot of food a day! The general rule of thumb is not to feed anything longer than the width of the cham's head. Also, young cham's are known to regurgitate, so be sure you aren't overfeeding or offering prey too large for him to swallow or digest. Does he poop regularly and are his urates nice and white?
It is possible he is too cold, if you aren't providing a basking area, but normally chams will move to a warmer spot if too cold or a cooler spot if too warm.
I'm glad to hear he's doing better with the hydration issue. If he's not getting misted regularly or provided drinking water more than once a day, you may have to explore other options for getting that all-important water/humidity to him. All the best..