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I would guess it's perhaps due to the volume of softcore content on the blogs rather than a softcore vs hardcore issue?
Reading the descriptions of what tumblr deems 'nsfw' vs 'adult', the word 'substantial' seems to be key. If most of your posts are softcore porn (ie: your blogs contain substantial amounts of softcore porn) that would appear to fit the tumblr definition of 'adult'. Tumblr doesn't seem to really address softcore vs hardcore, they simply address the volume of mature/adult-oriented content on any given blog.
If you want to save these blogs (in terms of getting them reindexed/switched back to 'nsfw') maybe include more non-porn content and then contact tumblr to get a re-assessment (if that's possible?)
that sucks though, good luck with whatever you decide to do
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