Hi!
Thank you very much for the details, it worked.
I have found the issue, it was a bug within the index table code, where the single worded post titles were not indexed separately as they should have – causing the problem with the relevance calculation as I presumed.
The bug was corrected, I also re-created the index table just to be sure. This fix will be included in the upcoming update of course, so you don’t have to worry about it anymore.
You should be seeing much more relevant results now.