I had a similar problem of difficulty with Germany taking too long to conquer France in the late days of HOI2-Arma and solved the problem by giving Belgium a peacetime IC mod. All combat is a little harder in AoD, and I wonder of the Belgians are overproducing and tipping the balance. And a mixed army serves Germany best.
Historically the Germans had a bit of luck in that the French blundered into the German plans, but as long as Germany wins by July or August that's OK--November is not OK.
Historically the Germans had a bit of luck in that the French blundered into the German plans, but as long as Germany wins by July or August that's OK--November is not OK.