Been using these in strikes and the daily just now and after 15 in a row, I still haven't gotten a single exotic.
What the actual -blam!- Bungie...
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Well even after waiting I used them up and didn't receive a single exotic.
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They put an internal timer on them. If you wait about 5 minutes after killing the elite to use your 3oC your chances should improve. I normally just run the highest lvl strikes and pop a coin at or right before I kill the end boss. Generally get one every 4-5 coins
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Xur is up to his no good tricks. Down with the worm face!
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I've started using one every other strike and doesn't make a difference really