It may not be the perk that is broken. But how bungie designed that Dungeon. Cause my fire team did not get many Heavy drops either. Now it is possible that the perk is broken in the dungeon and Bungie is not aware. Or Bungie designed it to be difficult and not have increased heavy drops.
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It is almost like Bungie has to pay someone for every block of heavy that is dropped on the field. LOL