I'm guessing you expand the cocofiber with dechlorinated water as well?
The wet rag being regular tap water won't hurt anything though.

Hm... Can't tell what the little yellow gadget on the side is, but it looks like you've got one of those stick on thermometer/hygrometer combos inside the cage. I kind of hate that they even sell those, because they really don't work. Your humidity might be more constant than you think, because those things measure all over the place....

Meal worms aren't good for them (too much chitin in the exoskeleton; makes them hard to digest) so that works out. If you can get him to take nightcrawler pieces those are very healthy. You can give them occasional pinkie mice or f/t silversides as treats. No more than once a month for the pinkies though, as they have a high fat content.

How are you transporting him? Just curious. I used to have to transport mine more often than I'd like, but I'd just remove his cage decorations, buckle his tank into the car, and he'd stay buried the whole time. If I had to put him in a transport container he'd flip out though.