From Rock Bass range maps I have seen - you are right on the extreme southern end of their present range - so you may be a bit too far south for any large populations of them.
I see you are using surface bugs in trying for them. I learned to fly fish catching Rock Bass in the local river when I was a kid and we always used wet flies - usually with a small spinner ahead of it. The flies that worked best were the "Yellow sally" the "Black Gnat" "Red Ibis"
etc. in size #6 or #8. Never had any luck on surface lures with them. They like a bit deeper hole under some brush right tight along the bank and we also found them in not so deep holes in weed pockets where there was a big rock or boulder they could hide around or under. Sometimes - we would get lucky and find a school of real big ones in a relatively small pool full of bigger rocks and boulders. They will also hang out deep around bridge pilings. But when I wanted a good mess to eat - I used a bobber and worms with a sinker on bottom and fished the brush piles along the bank and fished from the bank.
Hope this helps.
Thanks Warren. There seems to be a general consensus that subsurface is better for them. I only use topwater because I like the take and the guy that told me about this place catches plenty on top. There are places with plenty of rockbass around though. They are all over up here, that's why I was surprised not to catch any.
I will check on those flies you mentioned.
Thanks for the help!