Reduced Imperium Effects
This mod removes expansionism and the military upkeep penalties for both armies and fleets on the Imperium levels.
I don’t agree that every army and fleet should suddenly be more expensive just because you captured a settlement somewhere or if you got a client state which pushed you to the next Imperium level.
Likewise for the expansionism penalty. Other factions shouldn’t suddenly be angered because you increased in level.
Try my other mod if you only want to get rid of expansionism: No More Expansionism.