Owl--It's a storied place and one I've visited countless times, although today it is far from being my favorite destination in the Smokies (too many people). As for flies, those you mention are fine but I'd have some attractor patterns, some Parachute Adams for sure, and some small beadhead nymphs to fish in tandem with the dry flies.
I would also recommend two specific things to make for a better experience:
(1) If you have that option, go during the week, with Monday through Thursday being optimal days.
(2) I'd recommend a non-horse campground, although in the case of Bone Valley there's a sort of horse and no-horse separation, but sometimes the horse folks pay absolutely no attention on that score.