How about using the % of players on each country in a new way?
First you up the accuracy of field ack, range of radars on bases and add puffy ack on the front lines.
then you....
Reduce the accuracy of the field ack, range of radars on bases and number of puffy ack by the % number of playes each chesspiece has.
It may or may not make folks switch sides, but the lower % chesspiece(s) would get ack help when defending and longer range warning of incomming attack so they could defend better. It would also make it easyer for the lower % chesspiece to attack because the bigger chesspice would get less warning and ack help.
Dunno if this can be done by the coaders

at HTC, but its just an idea that po(o)pped up in my head just now.
Flame on!