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First assumption and most likely the case (I know at least 2 of the above sites) is that it wasn't you that got devalued for being the content farm, but sites in your link neighborhood.
Backlinks would be the obvious (meaning you lost weight big as they devalued THOSE sites) but it also can be from outbounds and the whole 'neighborhood'.
In my opinion, I wouldn't do anything to quick, see how they tweak the algo, keep consistent on the content and links and try to pull a few more strong links to boost them back up.
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