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I am seeing higher PR pages out-ranking pages that have the exact search in the title or on the page. The higher PR page does not have good keyword proximity, but the words are mentioned on the page. Google seems to match first based on PR, word presence on the page, then proximity including title. Typically higher PR pages on a site will get the majority of the traffic and draw from a ton of keyword variations due to the words being mentioned on the page but not necessarily next to each other.
In the searches you've been trying, could link text be a decider?