Hello Alex,
Sorry i didn't get your question regarding the matching operators. The place where we set the FUZZY to false is in the EXECUTE method of the class CL_SDQ_USMD_SEARCH_DATA_IMPL.
You can check the that once in debugging, which will ensure that the issue is not the IMPL class.
You can send me the mail with your contact details so that we can have a quick chat.
Best regards,
Girish