When you say stocked, do you mean from a fish hatchery? If it has been only 3 years, even in Florida the short answer is there may be no real hogs in there. Alot of people have no clue how big an honest 5-6lb bass is. At any rate thats all hear say for us sitting at computers miles away.
The only way your gonna figure it out is time on the water. Blindly chucking larger lures will help, but learning the depth, cover, bottum composistion, etc will put you on big fish consistantly.
Are you limited to the shore? If you can put a boat in with a depthfinder several times throughout the year you can really dial in a place. You can find out alot about a lake using live bait also.