From my experiences, you either click with your 1x1 partner or you don't. Like mmidnight stated, it's a trial-and-error kind of thing. If you click, then that's wonderful. If you don't, then you two politely agree to move along. I have been lucky to find partners that I've clicked with instantly. It also helps if you're friends with your partner beforehand so that they two of you just can play off of the wonderful energy between the two of you. Or maybe your creativity just clicks with one another.