I'm using the AMD blockchain drivers with Afterburner on Windows 10 Pro v1703 and it works fine. If you updated to the Windows 10 Fall Creators Update (v1709), that may be your problem as the blockchain drivers don't support the FCU.
have you verified your actual power consumption with killawatt or gpuz?
which ab version are you using? and is it the aug 23rd driver?
i haven't updated it all. i just installed windows and disabled updates completely.