Sorry for the delay in answer, I've been quite busy.

Just to clear up something, the actual number of Vampires in Toulouse is really low in the modern era, basically what it was at the end of the XIXth because of severla factors :
  • The event which wiped out two Covenants
  • A political will from the surviving Vampires, relatively young at that time, to drastically control Embraces, so as to better cement their rules and have a better idea of who's who in the limits of the metropolitan area
  • The easiness to move from one City to another in France (a lot of night train, low distance
...