Hi,
Thanks for the details.
The issue was caused by some minor misconfiguration. The primary ordering was set to title instead of relevance, I have changed it here: https://i.imgur.com/pGtH7Zt.png
I have also adjusted the keyword logic for better one for your case: https://i.imgur.com/bx9KTzP.png
Now you should see the most relevant matches on the top as expected.