There is an argument to be made that the stricter are the standards the less representative of Venice will be the results. Venice, for a long time, has been riddled with tradesmen, fishermen, ordinary folk. If you want to know the DNA of Venice, go sample the locals. Not people in the diaspora, people in Northern Europe, etc. Moreover, the more documentation you demand, the more likely you are going to skew the results toward the wealthy & well-to-do. If you demand people be able to prove they're from Venice, that their progenitors are from Venice, that their progenitors' progenitors are from Venice, etc. you're basically just sampling the nobility. The numbers you have here therefore are probably more representative of the nobility than Venice as a whole. Look at the extreme R1b numbers! This is exactly what would be expected from such a system. This is like determining the Y-DNA of Americans based upon a sampling of people with the surname "Rockefeller". The Boattini data gives us 70 samples for Veneto as a region. 10% is E-V13 & another 4% other E1b1b. That sounds about right for Veneto as a whole. However, E-V13 has a particular coastal distribution in the east of the Italian peninsula. Therefore I'd expect E-V13 to be slightly to somewhat above 10% in the historic Venetian population, perhaps 12 or 14%. 6-8% seems very, very, very low, but I think it can be explained by the sampling issues I addressed. Poor immigrants & poor residents will be far less likely to be able to prove they are true Venetians.