I think it is many things going on all at once.
All the boat waves in this clear water seems to change the bite. You can still catch the fish shallow, but they seem to really spread out and get even more spooky when there is more boat traffic.
Pre-fishing during the week hammers these fish to the point that some weekend days they are just spooked.
Saturday we fished a tournament out of the Red Top ramp, Gatewood had the ABA, Gaults had at least one, if not two tournaments going on there and not sure if any other tourneys were going on, but people go up and pre-fish all week by the time the weekend comes along you better be doing something different because they have already seen most of the fall classic baits.
Clear water can be a good thing, people still catch big sacks at Lanier, but I think the clarity right now is really hurting any kind of solid pattern from forming. I know at Weiss, always dirty water, boat waves don't seem to bother the fish too much, but at Toona, you can see the fish easing out to those suspend areas when it gets wavey, and when they do that they get very tough on me to catch.
The last thing is the drawdown / drought conditions have taken much of the sizable cover out of the water at this point and that has not helped in holding fish in those areas.