Looking at the virtues, arguably the most important thing in the game to balance, it seems that industry and knowledge only really has % boni boni based on what you have already built, and how much population you have. Thus making those trees bad for getting your empire up and running early, making it so that opening prosperity is by far the best gameplan for every game. Simple solution is to add some flat boni examples could be:
+3 production in cap
+1 production per city
+1 health from every tech earned
+4 science in capitol
+65% production towards settlers (maybe this already exists i dont know)
Libraries (or whatever is equivalent) provide 1 health in city
just something to give some boosts early
+3 production in cap
+1 production per city
+1 health from every tech earned
+4 science in capitol
+65% production towards settlers (maybe this already exists i dont know)
Libraries (or whatever is equivalent) provide 1 health in city
just something to give some boosts early