Would it be possible to investigate if the "Common word threshold" can be increased in the forum.
Increase the Common word threshold on the search settings page. The default is 5%, depending on the board, somewhere between 10 and 60% may be more useful.
You need to recreate the search index.
I think this would make it easier to find if a post/question exists so that users don't post similar questions all the time.
( I tried to find out when the frequency calibration range was changed for RT3S but failed to find something , I think I saw it in some new beta post )