We already have reduced the ranges , see the max range I have seen of any foot archer unit in the game is 209 (?) of the Saka foot archers . In reality, there is no single type of arrow which is going to be used and you cannot translate that into statistics, the killing range is 20-30/40/50 (take your pick) metres . Even then, the chances of piercing good mail armour is non existant, a solid piece like Bronze Cuirass or soft linen (comparatively) will not really stand much chance against a heavy bow .
EDIT
Whatever the case, it is largely irrelevant since most armies did not rely on Skirmishers, most of the casualties occur during the rout, with arrows accounting for very few of them , the exceptions to this are of course the guerilla warfare ( Sweboz and Lusotanna ) and Steppe factions , both of which rely on skirmishing , which cannot be properly represented in our symmetrical battles .
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