Many webmasters and SEOs are stealing from themselves in their potential to rank in Google Search because they end up ranking the wrong pages for search terms. They are competing with themselves in many cases. Google does not always know which page to rank from a site for a query due to many things. One of which is 'too similar' content or 'wrong version' indexation. There are a number of ways to identify this problem and formulate strategies to fix this using on page and your own site power and relevance with clues from within as to which page is most important for given queries.