if you could do something to keep your temps down, then you could definately lower your light! i use a 1000 watt, and man, i keep it about 12 inches away...it's always a battle with temps though, isn't it?!
i personally wouldn't worry about those little spots in your third picture, if you worry about every little spots that appears on a leaf, there's a good chance you could overdo yourself into an even worse situation...i mean, shit happens, you know? say you're watering, and a few drops land on a leaf, you're probably gonna get some spots happening there...if multiple leaves, or a big chunk of your plant starts doing something, then it's time to worry...
really though, i know i've said it before, but this grow is definately a vast improvement over your last one, kudos! subbed btw