Here along the Texas Upper Gulf Coast, we use 1/4 to 1/2 oz jig-heads,
painted red with a number 2 hook. We put rubber tails similar to Blue Frog
Fluke Hopper Twin Tail Jig (white) on the jig. For good measure, we put a
small piece of shrimp on the hook.
To use this lure, let it drop to the bottom, and then pull the rod back making
the jig-head jump forward. Let it settle back on the bottom and reel in the slack.
Repeat until until the lure is brought back to rod. I usually let it sit on the bottom
just a few seconds before starting retrieval.
I don't know how FLA flounder react, but our Texas flounder really like it!
Also, if you have moving water, as in the water is coming out of the marshes
and mango, be on the downflow side. That is where flounder like to wait for
their prey. Easy pickings for them as the bait flows with the water.
Hope that helps some, and good luck,