"Where you click on the target does not affect where the arrow hits the target, but your accuracy (and thus your score) is affected by the quality of your equipment, whether you are wearing armour, and your ranged level."
-http://runescape.wikia.com/wiki/Ranging_Guild#Archery_competition
I would assume void works just the same with the accuracy bonus, but its probably not as good of a bonus as wearing d'hide.