Its been many, many, many years since I fished Back Bay. I had heard the bass fishing has been improving in recent years. The bass there used to be weed oriented or open water baitfish school oriented. If hydrilla and/or milfoil is the weeds, the bass are probably under it and a Johnson spoon, frog, weightless worm on top should be your primary presentations unless at low tide when fishing the outside edges would be the pattern with Traps, spinnerbaits, etc.
For the open water schools, you need to be aware of your surroundings and notice any surface activity, move to it quickly and then keep up with them via your scanning electronics. I don't know how well the Structure Scan functions for surface to 5' depths and can't guess since Lowrance does not indicate the degree of coverage for the two frequencies. I use Side Imaging and that will show fish away from the transducer in less than 1' depths but not in thick weeds.
Don't assume the larger bass will be "deep" they will be were the food is.