I am learning about this all myself now as I have Cherberus, Dyrium, Paoletti and Corini in my two girls. The best place to find out some of this info I think would be on the international Cane Corso forum as there are some old time breeders there will knowledge to the original lines. Some of the older breeders in the US and Canada might also have the knowledge you are looking for but don't often populate the forum board so are probably easier to contact by email.