I invite further discussion on this, and I'll see if I can come up with something good (or use something that comes out of the discussion) some time late next week when I'm no longer at a beach house in Florida.
I think two options sounds good- First seems quick and easy, eliminate all non R4 archers- all existing centres turn to R4.
Second option, somewhat more complicated, is to have maximum weapons caps on R4 (longbows) centre options to 65, R3 to 75, and R2 get 100 (crossbows). An alternative could also be to eliminate R2, have R4 with a maximum cap at 75 and R3 get max cap at 100. This also balances the archer/infantry game a bit.
