The Clinch can be a tough river for certain.... particularly the zebra midge business. The other day I used 6.5 X at the Church in the afternoon and couldn't buy a fish. There were a bunch of "midge balls" going past me and I might have tried a Griffith's knat.
Seems I will be "tweaking" flies for the Clinch forever as Shawn & Beto keep finding "new" bugs and new "forms" of them.
Check out Shawn's underwater bug & trout videos on YouTube; they have made me "think" differently about trout behavior...