Well I'd improve the archers differently. I'd increase the number of arrows to 36 (2.5 minutes of shooting with 4 second reload), and then slightly increase the lethality to maybe 18% or possibly lower the armor modifier to maybe 0.9. Doing both might be too much. Giving the HA the SBOW is fine. The idea is to retain the need for the archers to be protected so as to preserve the combined arms gameplay.