Adding armor is no problem, my issue is just the number of volleys fired. Lowering the number of volleys i dont like the idea of because i know that *I* can get that many shots off. Changing the damage each volley causes....go ahead if you want weaker archer
Personally i didnt like how weak they were before. Slowing unit speed down makes archers worth while for me. Even Archer heavy AI armies i can still handle because i just use loose formation while im getting close which really helps cut down on casualties.