Hi,
I get some like that on my Dalmatie when there is too much rain, or too much sun - but rather with too much rain.
How is the weather at your location at the moment of ripening ?
Is it just with that strain of figs ? Do you have more than one strain in that field? Could be a problem with that strain ...
Figs that are not exposed but rather protected by the leaves tend to have less problems.
You should try to let your trees get more dense on their canopy. Of course if they lost their leaves because of poor watering ...