Good catch, I am noticing this too and it's starting to bother me a little. This brings back memories though, I remember back in the day re-texturing units for Rome I and I had to alter the sprites.. what a load of work especially if you're doing all 3 Roman factions lol.
There should be a way to fix this and someday you will find the sprites folder, gotta make your mods as perfect as you can
I would help you but, modding becomes an addiction for me when I start and I'm not ready to get sucked in to it at the moment lol.
Still though, well done, this was a much needed fix. To the people complaining about "but the germans were that tall". Google human proportions and you will find most of the time, the taller a human is, the only thing that really changes is the length of the legs (not so much the torso or head etc.) The system CA implemented here is taller = make everything bigger, therefore what you get are giants not tall human beings.