I'm from Italy,
and I indroduced Valle Negra in the States, giving this name (means Dark Valley).
Valle Negra is from a narrow valley in Alps mountains (middle Valle Camonica) during a my botanical research (not about figs).
This name was by me done from the fact that, in the morning, the steep slope where is the fig tree, faced W, is particularly dark.
I collected this because I looked for, (and till now do) to find figs adapt for "mountain climate" (wet-cold).
I prepared a lot of cuttings, and distributed to the States, but I do not conserved they, and for so I do not have "motherplant" to my home.
About your questions:
1) Normally brebas are not pollenized, for so IF the plant produces breba, do this, if Blastophaga exists or not.
2) The "common figs" so meaning "permanent", in the second fruiting (true-fig): if exists the insect (and this is in phase of time of ripening) is pollenized, ripen and and bear seeds. If not, it ripen without seeds.
3) The "Smyrna and San Pietro TYPE", Myrna, Inchario, Lampeira ...: with second fruiting "caducous", if there is NOT pollenizer fruits drop unripe.
4) The first bearing condition for have pollenizer is to have a caprifig trees within a mile were are female trees: The female Blastophaga flyes only a mile from the host-caprifig, and maybe two .... with the wind in favor, to pollinate, (or deposit her eggs in another caprifig). To rely on a single insect dragged by the wind for five miles is pure case.
5) Among "caducous" abovesaid, there are the best figs at all.
6) There are differences (Juicy, flavor, consistency) in "permanent" IF are pollenized or not.
7) It is extremely easy to control if a fig is pollenized: take a "second fruiting" fruit, well ripened (better if is overriped and smashed to the ground): dissolve the pulp in a glass of water, if the seeds (small grains) go deep these are full and then have been pollinated. If they float they are hollow and not pollinated.
Your comment are welcome.
Allowable to clarify.
Ciao, B.