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I'd say for most of my clients without looking is the sites coming in lack huge amounts of relevance... If you do a search you may not have the keywords you're going after inside the URL, Title, URL-Slug, Headers etc... but honestly the first 3 are where it's at, you can screw up your anchor text with nothing but generics and do well. I would of course hit around your main keywords if you've not done that. Also double check to see if your links are even indexed.