Anchoring up and chumming over wrecks and structure can also be very good. By starting a chum line behind the anchored boat the chum drifts over the underwater structure and draws fish up. It is the best way to thoroughly work over a wreck or structure. it seems we have had the best luck on king fish with this technique.
If conditions don't let you anchor the boat up the last technique is to drift fish. This can be very good around shrimp boats. It is believed that fish will follow shrimp boats for days. So by getting behind a actively trolling shrimp boat and drifting with flies on sinking lines or drifting around an anchored up shrimp boat can be very productive. You can also drift over wrecks and underwater structure. But typically you only get one or two shots at those fish before you have drifted to far from the structure/wreck.