Nothing is easier to take care than BlueGrass in Pa. Cold Hardness Zone 5. But South florida is Cold Hardiness Zone 10 not 5 and St Augustine is nothing like Bluegrass.
I strongly suggest you hire a professional Lawn Care Company. I believe it will cost you less in the long run.
it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.
You can lead a Donkey to water but you can't make the Jackass Drink