If he is doing that after you mist him he is probably hoping to warm up quickly. I would add more branches or vines at varying distances from the light, so he can choose the temperature gradient that best suits him. Don't be afraid to move the basking spot up a little higher.
I personally think your lighting is fine. The Reptiglo brand is a little weaker than the Reptisun equivalent, so the Reptiglo 10.0 has more in common with the Reptisun 5.0 as far as output, especially through screen. Even so, the Reptisun 10.0 outputs about as much UVB as your chameleon would be exposed to outside in the early morning, say around 8-9am. Which is not bad or excessive, since panthers and veileds happily bask in full sun at noon. So in my opinion, there's nothing wrong with your lighting. I would just add more vines and perches and see how he does from there.