Either just my Ruin Wings suck, or this is the biggest bogus perk in all of Destiny. I have never gotten extra Heavy Drops. I think I do get a little more ammo per drop, but I can do a ROC strike with or without Ruin Wings and the results of the drop rate are the same +/- a small percentage.
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I use them alot and just run around saying ooooh piece of candy. Ooh another piece of candy.