Kraxis,

I think lethality is a constant. You might get reduced effectiveness of archers at short range as you raise the speed parameter. That was what happened in WE/MI, due to the tendency of the archer to overshoot the target on low trajectories. At long range, you have reduced kills because the positional error due to accuracy is greater. I think you have to increase the accuracy to maintain the same kills/volley at longer range. That will help make up for the lost effectiveness at short range as well.