Hah! I felt the same way when I first decided to rec. You don't want to say the same thing that everyone else has said but you want to get across your enthusiasm. I usually like doing a quote from the story that is enticing but doesn't give anything away.

You don't have to worry though. You've been doing great so far. And I love that you've blown past the minimum number of recs for the month already. I was just starting to get into the fandom last year via Crack Van when we have a few dry months. Your recs have re-energized me. Thanks!