I've been doing all of my campaigning in the east where the prevalence of archers is much higher. The kill rates of archers is insane period. Kill speed mod or not. You will quickly learn fighting Egypt as a greek nation to bring your own archers and lots of them. The Egyptians will simply bring half their force in archers/skirms and walk up to your phalanx lines and decimate them.

I had a few battles early on as the Seleucids where I had a numerical superiority and what I thought were superior units. Untill the Egyptians destroyed my phalanxes in 5/6 volleys.