Also did you try using the Hotfix 10.10c drivers on AMD's site with the new crossfire profiles. If you are on a old Crossfire profile sometimes it can bork your crossfire scaling
scaling worked in all games but bfbc2 (metro worked nicely). So I decided to revert back to 10.5a and scaling returned.
Yea i tried the 10.10 hotfix, and regular. I googled it some more, and others are having problems with scaling. No clue why. But 10.5 it is for me for now.