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Well one example was I approached a set with two girls and three guys

Good lord, and you didn't stop to think that maybe they were both taken? It is almost never a good idea to go after girls that are already with other guys. Say or do the wrong thing and you could well get your ass kicked. I've seen it happen before, and it is not a pleasant thing. Considering you're having quite a few issues picking up women, and they are using escape methods, you're lucky to not have gotten any form of lashing from the guys.
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the other dragged her off to the toilet...
This is never a good sign. It means that the two of them are trying to escape from you, which means that you're saying or doing something wrong to an extreme extent.
The problem doesn't seem to be with your game plan. Establishing a time constraint is an awesome idea because it shows that you are a busy guy. It is most likely with what you are saying and doing. Reading this and your opinion and question routines seems like an incredibly boring time. If you want to have any chance of getting their number, you have to be entertaining and build the interaction up. You want to make it so that she is leaving the conversation wanting more out of you. That is how you get the number, and that is how you get the second interaction.