You double posted How many times have you farmed them, how many times have you died trying to get there...you might have the anti farm code on you. Do some missions and quests, dont do a run 4 or 6 times (sucessfully) then complain of a nerf. Im guessing you either are having bad luck or have anti farm code.
I have about the same luck. I have been solo farming for IDS's for a while now, and still have never got one to drop. I gave up on it about 2 months ago.
today i went farming with 3 other people. I died early trying my new build to no avail, but as the other 2 went farther into the cave, one guy got 2 ids drops the other none (lol). My other 55 farmer friend also got one too today. I think i see a patern here.