Been testing out the doom fang pauldrons with various void weapons and have a found a few (positive outlook, and pointed inquiry so far) that are not getting the damage boost from the doom fangs, even though their kills trigger the void weapon boost buff to appear on screen. Haven't gone through all my void weapons, but I imagine these aren't the only two bugged. Something to look into Bungie. Additional note: the bugged weapons are from different expansions and have no perks in common.