Yepp it really makes a difference to get the best governors... especially when trade incomes are coming down and you empire is big and sprawling and every guv is getting vices... But it is a pain... Unless you keep track of all egilible units and check every new unit in every turn. Then you have to play really consciously... oh well, could have been made easier so that I don't have to look through all "back wood fort"...
Never mind, still great game