I don't know if this has already been noted or not, but (hell it's 41 pages of posts ), I found something about the Fury/Blizzard max clock speed.

Take a look at this: https://github.com/dmaxl/cgminer/blob/master/driver-zeus.h#L21


So, I'm guessing that if you want to go over 382, you'd need to compile your own cgminer.