For the second questions I always send custom questions, never from the eharmony list.
My matches seem to enjoy the questions. Some say they are thought provoking.
A few close after I send the questions. I guess if my questions are too difficult to answer then they should close 
One of my favorite questions is "You can invite 4 people (throughout history) to dinner. Who and Why?"
Do you have any favorite second questions (not on the eharmony list) ?