How do I show a different metric than the average in the fivestar rating/display

I have two kinds of users, experts & peers rating is weighted. When a user casts a vote (fivestar) on a node, I compute a weighted average of all the votes based on each user's status - expert/peer. This is saved to the votingapi_cache table with a tag 'fivestar' and function 'weightedAverage'. I do this via a custom module that implements hook_votingapi_results_alter(). I want the article to show this weightedAverage as the current rating for the article, rather than the 'vote' tag & 'average' function that the fivestar module picks up by default. How do I do that? Also,a related question is how can change the default tag for the fivestar module from 'vote' to something else?

Thanks

- ashok