i pop one right after i kill a strike boss depending if it counts as a ultra or major ( i.e omnigul, flayers) but after using twenty coins i have yet to have a exotic drop? which is weird cause the most ive had to have used is five or seven but i thought that after you kill a strike boss and a exotic doesnt drop there's a percentage increase and timer to get the the percentage increase next time i use a three of coins so is this a spot of really bad luck? or am using them wrong?
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Try popping one right before your fight. That gives everything the time to "cool down" before using the next one. Using this method gets me an exotic every 4-6 uses.