Speedmaster,
good question!
However, figs are genetically built to be either uniferous (1 crop) or biferous (2 crop)
Biferous figs are either:
San Pedro - 2 crop: Breba (ripening in May?) and main crop to ripe in September but need wasp!
Cachopeiro (Port.classification) - again 2 crop: Breba ripe in May and main in September without wasp
You cannot force a fig to give you brebas!
Occasionally an uniferous type gives a lone Breba but, that is an 'accident' !
By this time many 'uniferous' types show figlets positioned to give you the ilusion of would be Brebas.
The great majority will dry and fall to the ground. Many common and Smyrna varieties do this.
Francisco
Portugal