Every August/September here I have to go to shallow (10 to 15fow) structures, and fish are usually right at the edge of points and humps where it drops off into deeper water. Key Ranch Drop-off, Key Ranch North, Saint Annes East, north finger of Spillway Hump, Dam Drop-off, West Dam Point, Merimac Point and Game Warden Hump are my best spots for this. Also, almost every year I have to switch to a #2 Mepps on 10lb fluorocarbon line with 3/16 mash-on weight about 15 inches up the line. Last year I was able to catch fish on #4 all year - an exception.
The technique when fishing the #2 on shallow structures is to position the boat a good cast away from where you marked fish (I always use a toss-over marker to mark them - usually just to the side of fish - not on top of them). Then cast beyond the fish, let the Mepps go to the bottom and then swim it sideways along the bottom - 4 to 6 turns on my 6:1 reel. Unlike fishing more vertically with a #4 I hold the medium action rod low and out to the side. In my minds eye I like to see the Mepps swimming up the slope a few feet at a time. When it gets to the fish, they hit it as I start another drag. Sometimes I take up the slack before each drag, but sometimes I leave a little slack in the line and start the drag with a jerk and keep reeling the 4 to 6 turns. This latter technique is the only way I can catch them some years in Aug/Sep. A sign that we're in this mode of fishing is when the guides have to troll with hell-pet rigs and seeing TFF complaints about when is the "slab bite" going to return. I dislike trolling and with the #2 Mepps technique above, I don't have to. Hope this helps.