Yes, I think OOB Europe is imbalanced in many ways. After the right strategy became apparent, so far I have only lost 1 game as Germany with OOB rules out of 13 games in total, and that loss was mainly caused by a combination of surprise (my opponent put 4 infantry in Bessarabia and I had never faced that bid before) and terrible dice.
Let’s play with the balance. Right now I am testing with Ragnell and TGC with an additional German infantry removed from Romania, not sure if you have tried that out before but it seems to have a positive effect on the balance.