Related Post not really related with Taxonomy

Hello and first of all, thanks to have developed this extension. I’m working to switch from an old Related Posts to this version.

For now, my blog have more than 2000 entries till 2006. Unfortunately, I don’t find how to correctly settle (if it’s possible) how the plugin will choose to propose the 6 related post.

I would to use the query especially with the similar tags from other articles, but unfortunately, it’s seem to only use the first one when I choose “including taxonomy” in the General Setting.

In the Query menu, what I can do don’t really affect that kind of selection. It just le me push the recent or older post out of 2000…

Is there something I’ve missed, or the extension Is not thinked for that kind of use ?

The page I need help with: [log in to see the link]