Have you tried the block chain drivers?
I have been using blockchain drivers and still got an issue but I fixed it.. just removed with DDU and then reinstalled the same driver and wuala it went back to 207.2 mhs/s
Blockchain drivers I have tried to use when they came out, but I switched back. I am currently using driver Version 22.19.659.1 (Device Manager).
@ doodleza reinstaling same driver worked? Nice. What cards do you have?