My prefered scale for mass battalions wargaming is 10mm, as you get, well, mass battalions.
The Regiment of Foote rules are written with Peter Pig’s 15mm figures in mind- and state 4 to a base. On the same 3cm x 3cm base I get 16 pike men. I feel it looks far more like a pikeblock. My units are 100 bodies, not 24.