Just noticed that ckolivas commited a changeset a few hours ago with an update to the bitfury driver. Re-compiling from source, with those changes, made a difference in the numbers I was seeing in cgminer. Cgminer reported hash rate went from around 1.7-1.8Gh/s to around 2.2 - 2.5Gh/s.
Nice one, have you got a link to the source? My search fu has failed as I'm tired
Thanks.https://github.com/ckolivas/cgminer