Sometimes, I let the bait sit on the bottom for a while before moving it. If a cold front comes through, I'll fish deeper pockets on the outside of any sharp curve. At any time of year, flounders relate to tidal movements. Many anglers prefer a strong incoming tide that pushes salty water into coves. It also carries fresh baitfish.
Flounders follow baitfish, looking for opportunities to strike.
Passes and cuts opening into bayous create choke points that concentrate baitfish, creating good hunting conditions for hungry flounders. High tides also flood marshes, providing flounders better access to cover. The beginning of the incoming tide seems to work real well. When tide slacks off, fish slack off. You'll still pick up a few fish, but it's not as good as on a strong incoming tide.