I didn't get my first sewer pink until I hit 55 and we were running 3-4 hours a night. Then I got 2 in 3 runs. I've been at 56 now for a couple of months and have only gotten 6 more, so that's a total of 8 pinks and my best one was a raid Roach recurve recipe, sad thing there was it dropped a week before set bonuses were put on crafted pieces so I only got 100k for it instead of the 750k it was worth the next week. So I get what bad luck is buddy. Just keep your head up and continue to farm sooner or later something will drop and put you in the green again. Until then supplement with AO runs to keep your head above the water