56 Crota completions.....no telling how many of those were on Normal. Not to diminish your effort, but 3 times a week since release I doubt that because you'd have way more completions than me and I've gotten 3. Just keep on trying it will eventually fall.
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Just look at Destiney Tracker. It says you have completed Crota Hard Mode 19 times and have ran norm 39 times. Hope this helps.