Instead of constantly looking over your shoulder regarding vassal states (eww they gaining on population, or ew they getting larger than they should). I suggest that vassal states should be exposed to an entirely new level of pwndom. A civic should be made available called "Empire" or "Imperium" (neither of which is present as current civics) that denies membership in Over/Under council.
Vassalage should be a multi-stage process that could result in your vassal becoming a permanent organ of your civ. Sorry, I was reading about "Boney" as his methods
Vassalage should be a multi-stage process that could result in your vassal becoming a permanent organ of your civ. Sorry, I was reading about "Boney" as his methods