What are the roads like in Florida?? I know that our roads are quite abrasive. Mix that with the heat (which you also have) and freeway speeds and tires seem to wear pretty fast here.
I will occasionally use the power available but no burn outs, and very few jack rabbit starts. Mostly just normal riding at 65-85. I also don't wait to see the cords before replacing a tire. The Bridgestone probably had another 1000 miles on it going by tread depth, but at low speeds it was wobbling like a drunk on Bourbon Street.
I did notice that on a 1500 mile trip just before I replaced the tires, that the tread depth was going away much faster than earlier in the tires life. So, you might want to keep a closer eye on them as your mileage increases.