Openers barely matter, provided it's even remotely normal(IE don't throw up on her).
Especially in a club, a girl usually doesn't even really HEAR your opener. It's pretty much pure body language(which includes facial expression).
And really, pretty much the entire early interaction has almost nothing to do with anything you talk about. It's purely a looks/type/vibe thing. If she thinks you're cute, you are giving off an interesting vibe, you're basically good, provided you're somewhat normal.
Yes, awesomely tight "verbal game" can help. Especially deeper into the interaction. But it's not needed. You can have a lot of success, while doing very little on the verbal front.
The reason the girls were into you, was not that you were "trying hard". It was that they liked your look. You seemed like someone they would be interested in getting to know better. And you're right, they would have been receptive to you continuing. Because what you say is only a small portion of the total interaction. Being smooth is nice, but it's not needed.
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Quote:
Build an emotional connection through your hard throbbing cock.
Build trust and comfort by holding their hands and covertly rubbing your elbows on their nipples.
RSDTyler