Well that sucks. I took the time to count how many you ran in the last week and it was about 25(on your hunter). And this last week the did have an increase to their drop rate. So it truly sucks if you are telling the truth Maybe the chance increases If you play a lot consecutively. I usually play 8 at a time.and I usually try to go through them fast. The drop rate was still good for me on the 320strikes. And is suppose to be higher on the heroic strikes.