Nice job, shows how allies have the most wins in these match setups.
I don't think a 5% +/- means anything besides it's a very balanced match up.
We will never achieve a perfect 50-50 split as long as CoH has more than 1 faction and has unsymmetrical maps. In CS:GO the only competitive map that has an
almost perfect 50-50 ratio is dust2 which is like 49-51 T sided. Otherwise it's very common to see 55-45, 53-47, 57-43 etc.
But numbers aren't the end all anyway, crossing the woods is probably hell for USF if the enemy picks wehrmacht due to snipers.