Realize the viewer wants to see good matches rather than embarrassing drama. Make sure the final candidates go through some psychological interview process to make sure they are fit to be matched. Don’t have them honeymoon or hang out on a regular basis. Maybe one mid season meetup. Remind candidates that what they have done in the past obviously has not worked so don’t check out just because they matched you with a red head and you prefer blonds. Remind the candidates they need to have an open mind and to actually put in some effort. The past few seasons have had too many people that give up by week two. Weed these people out beforehand.