For what its worth I read an article the other day about Fall fishing and they were talking about using small spinnerbaits like the mini Strike King for example. I think this would work on the Rock too. I noticed all the minnows that were surfacing were pretty small, in that 2-2 1/2 inch range. I never thought to use something that small, always thought of those as a pond lure ,but I will be trying this technique soon to see if it works. They were using light line and open face reels(light lure easier to throw)and say they were very succesful using this method.
I think all the fish are staying deep or in the shade and probably relating closer to the main lake than in the backs of coves and creeks. Lack of rain and any current what so ever is keeping fish toward the main lake areas. IMO.
Hope this helps.