Slush went to vardiff or autodiff (whatever you want to call it.) You cant select worker diff now, just join the pool. When I first put the bitfury on it would only show up on Slush as 4GH/s
I switched the worker diff to 1 and it reported right on up to 27GH/s.

The reason I did was, when I put my blades on slush they reported very low as well. I use the stratum proxy for the blades so I could see the share diff there. When I switched the blades to diff 1 I noticed in the stratum proxy it was auto adjusting. I cant remember where they got to but it was nowhere near 1.

At any rate, you dont have the diff choice on Slush anymore. Just point to it and give maybe 20 min or so.

Regards,