Only use one coin at a time (Don't stack them). It will disappear when you defeat a boss. To be safe wait 15 minutes from after you defeated the boss before activating one more coin. Each time you don't get an exotic the next coin you activate will give you a higher chance from the next boss kill. Using this method you should expect to see maybe two exotics for every 12-15 coins used.
The time you have to wait is because if you activate it sooner the game might think you are trying to farm with the coins.
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Um three of coins have a 5 min timer but I agree some bosses aren't completely full bosses like Psion
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Good call. Yeah 15 minutes was more of a conservative guess than fact just know you can't activate them too quickly.
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I think its higher wheres tour proof
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I use that same method, I would say my drop rate is slightly higher. I see about 1 exotic every 5 coins unless I'm horrendously unlucky. I use them on heroic strikes. If I'm lucky (I have been this week!), I get 2-3 every 10 coins. Just thought I'd throw in my 2 cents.
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I use the same method but dont wait 15 minutes just like 5 and then activate at boss. I probably get on average 1 every 3-4! Again just thought i'd put my bit in :D