@bakerbei
I think primarily when you want to improve your play as a nation like Germany, you have to analyze and examine where you might have gone wrong, or what battles/moves could have been the deciding factor that tipped the game against you.
For instance, you lost Barbarossa, but why? Where did you prioritize your main push? Novgorod? Ukraine? Did you bring enough units?
Putting a Major IC on Romania is viable, but really you shouldn’t need it. If you’re minimizing your losses and decisively choosing your battles you’ll get to Kiev and Stalingrad in no time.