I think you should forget about Mystery methods and just do whatever you feel comfortable doing or saying. I know you feel more confident using canned opened or canned material in general and that's ok, it's part of the learning process but the faster you transition to a more "natural" game the faster your game is going to improve.
Approaching girls to have aa under control is great but that's just the tip of the iceberg , the important part is to transition that into a conversation.
Maybe this video can help you out, here you have 11 tips that you can use for daygame and some of them for nightgame too.
http://www.youtube.com/watch?v=BWeQJmdHTns&feature=plcp
Good luck!