I am sorry to see this very frustrating situation. One of the things I do is to try out figs, and see how they react to my area, and how well they do. If the fig does not work for you, and keeps dropping the figs after you have exhausted methods of care, I would suggest trying another variety in your area.
I have given away figs to other people (of course, in other Hardiness zones) to see if they have better luck with them. That way, my work and care pay off with another variety... unless, of course, the particular tree has a sentimental value or something like that.
Best of luck there!