I'll third the suggestion on the Zebra midges. They are awesome on the tailwaters dropped behind a dry and I've caught fish in the Smokies on them also. I started fishing them this year and now hardly use anything else on at least 1 tailwater I fish. The only downside is the light tippet you usually need
In the Smokies, they seem particularly useful in some of the SLOW pools in fall when the water is low. I drop it off of a small dry, such as a bwo parachute or sparkle dun). Great little flies... 8-)
David Knapp