Using search engine optimiser tools
One thing I have been looking around with the different engine tools.
be careful when using a tool and thinking its correct and precise.
I have a live scores site and made changes to get 100% correct optimization
and then I lost my position.
I used the tool http://www.rankingtoday.com/ just an FYI but cnn.com is not perfect.
To sum up - if you are happy with your site and traffic, leave it like it is and watch out for keyword stuffing and keep updating the content is the best tip I could provide. Ps linking also helps.