Planning an Early Medieval Setting with Historical Pseudo-Arthurian Stylings

Thank you for the response! I have tried to simplify some of the domain management rules, at least until I see if my players will lean into that aspect of play. Maybe I made some errors in my assumptions that are throwing off the math. If I just increase the domain expenses per family, that would probably solve my problem. It also seems that I need to choose a smaller area so that the calculated population would be a County or Principality instead of a Duchy?