I have been playing FPW since the mid 1980s and have used an organisation where the Germans are in battalions of 28 figures and the French in 20 (the difference being to match the difference in theoretical establishment).
However, this period is the beginning of small unit tactics of which the Germans were strong advocates and frequently divided battalions into half battalions, further divided half battalions into individual companies and companies into platoons, as the tactical situation required. My future games will be based on German battalions of four stands (probably of six figures) each representing a company. The French were not adverse to dividing battalions either, but due to a poorer quality of their officer and NCO classes they did it clumsily, failing to achieve it as efficiently as the Germans, and as a result I will make a French Battalion three stands (again probably of 6 figures) each representing two companies.
I agree with earlier comments that The Germans didn’t have it all their own way and on at least four occasions in the early battles their base tactic of marching to the sound of the guns and engaging the enemy wherever they found them led them into some dreadful situations and had the French commanders had been up to the mark the Germans would have been severely punished.