Best Practices for Getting More Relevant Related Posts

So first of all this plugin works very well and is doing everything I need it to do. But, I was wondering what are the best practices for when you create a post to help with the searching of other related articles.

I read through this posting: http://wordpress.org/support/topic/how-does-it-know-which-posts-are-related?replies=6, but it wasn’t totally clear to me so sorry if this redundant.

Now for example I have the plugin set up (http://junto.franklinstreetwebserver.com/) to show four related posts. Often times the first two are pretty relevant but the last two are kind of a stretch. There seems to be enough content on the blog to pull in four posts that are a little more closely related.

I have a feeling the results I am getting are due to how we have setup posts over the years. Because the tags and categories we us are a little too general in my opinion. But, before going through a bunch of posts and trying to updated how they are organized I wanted to ask the question to you all about what the ideal setup should be in order to get the best results using this plugin?

I know that there might not be a set order but could you give some general guidelines on the importance of how things are described?
For example: 1. Title, 2. Category, 3. Tag, 4. Keywords, 5. Post Content.

I have had this plugin on the dev site for more than a few days, so I feel that it has probably done its job of indexing the site.

Please let me know if you need anymore info.
Thanks,
Carter

http://wordpress.org/extend/plugins/related-posts-by-zemanta/