Bungie pleas fix the three of coins exotic drop rates. I play a lot of vanguard heroic strikes and I use a three of coins every other strike or after 15 mins of tower patrols ect. and I only get an exotic engram one every about every 6 uses AT BEST. And when I use them on the shade in oryx hm I only use one ever 20 mins or so and have only gotten 2 exotics in at least 25 three of coins uses.