I'm jealous! Only seen Lake Fork on Major League Fishing, and it looked like perfect fly water to me (shallow, with lots of structure). It should be close to spawning time, so the hogs may be on the prowl and ornery.
Clousers flat get it done with bass. In shallow water, a floating line is all you need. Strip them slowy and steadily. My favorite is probably chratreuse over white or gray, with olive a close second, but lots of colors work. I bet articulated streamers (like the Zoo Cougar you mentioned) could be dynamite, but I haven't figured out how to solve that puzzle yet. Let us know how it works!
I would definitely tie up some nice-sized gurglers (maybe size 4 and size 2?) in chartreuse with marabou tails. Those have been deadly for me in Florida, which isn't Texas but also isn't too far from it. Poppers, too, but those are a lot more work and don't seem to work any better than the quick-tie gurglers.
For big time fly fishing street cred, you could try some dry or emerger midge patterns when the bass are suspended and coming up to the surface. My experience has been that I can't get them to bite on much of anything under those conditions, but they seem to be eating midges, so just maybe....