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It seems like you should double check all your numbers and how you're running your tests, because your results do not make much sense.
if your numbers/tests are truly accurate -- I would segment down to google traffic and optimize for time on site. Its a better indicator of user satisfaction -- clicks can be baited and lead to a bad user experience -- but if the user stays on your site a long time, that's a pretty hard thing to fake or cheat for.
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