Figured I'd follow up again for any people with this problem in the future. I HATE when I find a person that posts an identical problem as me and they report that they fixed it, but they don't say how. So... Afterburner wasn't a permanent solution. The problem returned. But I seemed to have actually fixed it for good by disabling ULPS in the registry. There are plenty of guides around for how to do this. ULPS was putting by 2nd card to sleep while in 2d mode. When the card went to sleep, the powertune on the second card returned to 0%. Since crossfire uses the settings of the lower card, they both ran at 0% and caused me issues with throttling.