mark, i'd try to get that hps closer, 12 inches is great, it'll help reduce the stretch dramatically. as for the 12-12 stretch, you can expect at least a double height stretch. it will be about two weeks before you start noticing any bud mass, another week or two more for the first trichs.

deff continue to feed with your veg nutes, as these guys can go chloro realy quick. i recomend veg nutes for the first two weeks of flower.

also, if you can, cool it down in there a little; they look like they are too warm. mine like temps in the sixties, and anything below...

hope that helps, and looking great!