Here are a few podcasts from the Chameleon Academy that you should find useful ...
Check out "Ep 2: Surprise! Chameleon Babies!! Yay!...Yikes!!" via web:
Check out "Ep 67: Housing Baby Chameleons" via web:
Check out "Chameleons in Baby Cages" via web:
I'm not sure I'm understanding your question correctly but your calcium supplement should be without D3. I like the Reptical without D3 for every feeding and RepashyLoD twice a month. You can buy feeder cups online or make them from large deli cups.
As already mentioned, it sounds like he is just exploring his new surroundings. You have a nice amount of branches but I think I would add some smaller diameter ones that he can grasp easier.
I feel that article is still pretty accurate today. I've had wc imports from Kenya, Cameroon and Madagascar. My first was a Trioceros jacksonii xantholophus from Kenya that I was able to keep for close to 5yrs. My second was a Trioceros Cristatus from Cameroon that I still have today at 5yrs...