Im curious to see the design and content on your site. To me it sounds like it is a striclty MFA (made for adsense) type of site. What I mean by that is that I assume your content isn't what your users are expecting to see, or it is content that doesn't help them. That would explain the high ctr. Even if you blended the ads and had them above the fold and incorporated all of the different tactics there must be a reason why your users are clicking away.
In any event kudos on the high ctr, I wold be interested to see what type of site and how you designed your layout.
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