I have run this NF more times than any other without getting the strike specific drop. Whatever fix Bungie put in to increase the drop rate each time you don't get a strike specific drop is not applied/working on the Tree of Probabilities. Please take another look at this NF because the DFA will not drop and my chances of getting it to drop are definitely not going up or I would be at 100% drop right now.
Edit: It finally dropped and I got the masterwork version. I love you again Bungie
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I have a total of 151 runs of that nightfall and still don't have it. [spoiler]Granted only 1 is after Forsaken launched but still. I gave up[/spoiler]