There is no such thing as balance in a pvp MMO, there alway the flavor of the month and this will be the cycle. This game is far off base from what people call a balance MMO.
Alll Iam proposing is not 4k GM , but to put to a stop to one unit army why not make the units more unique,.
Make 100 dif stats for archers around a balance x factor ( base stats) +, - 15% attack,def stats.
Maybe even allowing players to trade units in the future with in ones race.
You still have to find a good base stat but this would allow, a variable to rock, paper , scisssors what we have now. I know in the next years of this game there will alway be one unit more op than the other this is just a way to put a end to it. Now its luck.