Bill...
Can't answer your questions about growing figs in the humid, South-Florida area. I have friends who live in the Stuart/Palm City, area (East-Coast) of Florida. I recently payed them a visit. While driving around, seeing all the sights, etc, I didn't see one fig tree growing in any of the yards. Ummmm....I wondered why. I asked a few questions at the local garden centers and nurseries, and was told that fig trees can suffer from terrible nematode infestations, and from rust/mildew problems. The sandy soils = nematodes, and humid air after the frequent rains = rust and mildew.
I will be going back down to Florida, for another visit in a few weeks, and I am bringing a dormant fig tree along with me. My friends love figs. I will plant the tree in a very large, 25-gallon container. I will NOT plant the fig tree in the ground, which is nothing but sand. My friends will continue to grow this fig tree in the large container, near their pool. BTW, the containerized tree will rest on a dolly, and prevent hernias. This will allow the tree to be rolled around. This, I think, will control/eliminate the nematode infestations....as nematodes will not be able to migrate into the container.
However, the rust and mildew infections, if any, will have to be controlled. Just a guess on my part, but I would try blowing a stream of fast-moving air from a fan, over, and around, the leaves. This might be helpful, and this fast-moving, continuous stream of cooler air, will evaporate any water droplets that cling to the leaves from rain and morning dews. Hopefully, by doing this, it will eliminate/control rust and mildew without the use of chemicals. Who wants chemicals, and insecticides on what they will eat?
I am sure that those forum members who grow figs in Florida will help out, and answer your questions. My suggestions are just speculations.
Frank