I'll be damned, I forgot all about amdcccle (I'd set the "refresh" option to fix the flicker, and it didn't do it, but I figured it eventually would.) Ok, now I can get 3300 fps on glxgears for whatever good that does...

...Since I really only care about video I'm still screwed. Thanks for the tip though! I feel like we're on the verge of a breakthrough.

(Off the record I also felt that way in January... December... November...)