If you haven’t yet come across the wealth of knowledge that is George Nafziger then I urge you to investigate what he has made available. Whilst he has written a host of books for WW2, the Napoleonic Wars, the Seven Years War, (and works for earlier periods), he was also well know for his collection of army lists. Originally these were available directly from George Nafziger but it was a rather creaky affair to say the least. Now however they are for free directly through The Combined Arms Research Library
It is still a bit awkward using the ‘Finding Aid’, but it is definitely worth working your way through the vast resource to find the wealth of information available there.