How low is the cool side? The UV really won't do much for temperature so it's useless to move it off the basking tbh. CHE's are extremely hot and not really safe to use with tanks.

Red lights I'm not sure of. I personally don't like using any sort of visible light at night as it just doesn't seem like it'd be best, but iguanas supposedly can't see certain colors / rays so that's up to you.

The overhead freak out is perfectly natural! If you want it a little "easier" you can try coming at them from the side instead of over and they won't have a complete tantrum, but it takes a lot longer to catch the buggers .