Interesting you say that.
6' X 4' is the notional Blucher standard, but you're correct that it feels very, very tiny. You made excellent and creative use of that Reserve Move, though, which made me feel a bit better about it.
Still, a 3'' X 3'' footprint for each brigade is going to leave matters a bit busy.
Well, that, and the fact that the two of you left 1/3 of the battlefield pretty much bereft of troops.