Hello,
I was playing as Prussia last night and noticed that every artillery has the same stats, therefore there is no reason to build the more up to date, costlier versions as they have the same capabilities. I have a feeling this isn't working as intended.

I also noticed that the mounted cavalry made dragoons very useless in most formations since they have basically the same stats at a tenth of the cost in horses.

Hope this helps in your de-bugging/balancing.