I use a layer of clay balls, but I also have a pipe connected to the bottom in case of water raising too much. It is like a tap and I can open it whenever it is needed.
I misunderstood! I am used to the british weather lol
You could also try an air cooler. They work well when windows are open and you can add water and ice to it.
I think if you have the right temp, the basking may not be needed. I would change the bulbs to a lower wattage but you mentioned you are using a dimmer so not sure how the heat is that high.
The uv-a helps chameleon's vision. They are colour blind without it. I know the zoomed uvb tubes also...