I found one real big mistake in all the sounds of your bigger weapons: You created the impact or the shot but you hear of course both of them. It is like this:
Bang (artillery/tank shot), time goes by, Bang (shell hit something and exploded).
You can hear the shooting and the explosion noise a very long distance (the explosion about 30km, the shot about 10km, depending of the wind situation, the leaves of trees, etc pp.)
So all your sounds sound only "half" for me
.Think about it.