What language were these proto-Albanian shepherds speaking? I think for now it was the Dardani, based on a fusion of the arguments that come from Noel Malcolm about Dardani shepherds, Matzinger and all the other linguists about which zone to seek out proto-Albanian language, etc, etc.
It is much harder to trace archaeologically and historically such shepherd populations, but since we know the richest Albanian vocabulary is precisely this part, this is where we must start and localise a minimal zone / region they lived and worked in, and then from there on out expand the search.