Practice skipping your baits under docks, learn the pitching + flipping game to quietly enter the water with your baits(although a loud splash can work too), try unconventional baits + methods, tune some baits to run right or left under boats
soft plastics are great around docks. many times i go weightless. a slow drop with subtle shakes drives them nuts when a weioghted presentations gets nothing. i've not had good luck with barges unless they are permanently there. then determine if they are sitting on the bottom or floating. if on bottom, use your electronic to find washout holes along the front edge or sides.