I've tried putting the MFA site URLs that show up in AdSense on my site in the competitive ad filter in my control panel, but so far I haven't been able to detect a noticeable jump up in earnings as a result (and sometimes it seems like using the CAF makes earnings go down). Has anyone else had this experience?
Those sites could be paying\bidding the same as the ones you filtered. Some keywords always get low CPC, not much you can do about it. If you don't mind me asking, what keywords are your site displaying ads for?