He looks pretty healthy, I don't see obvious signs of MBD. But yes, you will want to remove the night heat light. It should be completely dark in his cage at night, since light can keep him awake. As long as his cage is above 50F at night, he should be fine, regardless of age, as long as he has the right daytime temps. I would guess your house probably doesn't get below 60 unless you are in a very cold area.
That bulb looks like it should be good, but I don't have personal experience with the brand. How old is it? You will need to replace it every 6 months. Next time you buy one I would get a ReptiSun 5.0 or Arcadia 6%. I believe this is the specific bulb you have right now:
http://www.zilla-rules.com/products/tropical-series-uvb-flourescent-bulbs.htm
I would not use the orange cubes or any other Fluker cricket food. It is not very nutritious and is also generally more expensive. Carrots and kale are examples of two easily available cheap vegetables that are much healthier. The more variety you use the better.
The Herptivite is good, but it is a multivitamin and it should only be used once a month. You should only use plain calcium (no D3) every feeding so that he does not get overdosed on vitamins. You will also want to use calcium WITH D3 once a month.
Also, it is normal for chameleons to fall from time to time and usually it does not cause them problems. If he can't walk normally and falls regularly, this is a problem. Is it possible the sticks/vines are moving or rotating, causing him to fall off?