Trying to cross one variety with another to produce a different type, that is fertilizing one flower with pollen from the other variety.
The point in there is just that if the flower is not going to set fruit, it breaks off like that. All the things in the blossom drop sticky you read apply... all those are reasons why the flower will drop off instead of setting fruit.
Here's from that sticky:
Blossom drop is a reaction to stress -- the plant drops the blossoms to focus on survival. The stress can be from a variety of causes-- temperatures too low or too high, humidity too low or too high, too much or too little nitrogen, lack of water. Early in the season blossom drop often relates to night time temps going below 55.
So, I don't know what temps you are having in FLA right now, whether it could still be too hot and humid for it or whether you are having night time temps below 55 (here we are having night time temps around 20!). But any of those things can lead to blossom drop as you are seeing.
It is a problem with the conditions, not the plant, so if the conditions improve, the plant will start setting fruit.