I find that its hard to raise up newly conquered provinces morale in comparison to S1914 game which is much easier provinces especially near capital.
Substantial troops are tied up to garrison the cities that can be up to 3-5 units per province. Further, huge amount of resources are needed to invest in propaganda office. Tend to slow down the game and towards a less aggressive play.
Suggest to rebalance this to make it slightly easier to increase the province's morale.