I saw a 14.6 come out of Kissimmee last year and in my monthly tourney there are always double digit big fish. 7,8, and 9s are common. The only problem with the Kissimmee chain is the 100K acres that all looks fishy.
If you want to hunt in smaller water the phosphate pits around Lakeland and Mullberry are good spots. Many of them are public and don't get a lot of pressure.