Something I've found of late is to alternate the competitive list. Occasionally I just clear it to sort of "shock the system" or mix things up. After a while I start going through filtering out the new sites that show up as a second "stirring up" Keeps the ads on my site different. A lot of these MFAs are flash-in-the-pan which means after a while there is no point to keeping a dead url in the list. The variety in there seems to help keep earnings up.
To me it is all like the story i mentioned in the caption. Adsense is an enigma and google is too smart to play their cards close to their chest . Good content, Popular Niche and competitive ads ensures ecpm. Further It has also a bearing on the recession , slow down and timing . Have lot of sites Tons of original content and frequent updating. You can earn good cash!!
It's worth noting that it may take up to 24 hours for folks to see a difference in their earnings after applying a list from adsblacklist. Patience is a virtue, although I certainly understand the frustration of dealing with MFAs.
I use Adsblacklist.com but I see minimal impact on the earnings. Just use good keywords related to your posts to invite good, high-paying ads.