Acceptable confidence score with rhasspy-fuzzywuzzy

I have tuned a sentences.ini file that works fine with rhasspy-nlu package.
Right now, I just started working with rhasspy-fuzzywuzzy in order to be a bit less restrictive with the result of STT.

But, I get some results with very random text…of course the confidence score is lowered (aound 0.48)
From your experience, what confidence threshold do you recommend when using rhasspy-fuzzywuzzy ?