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Yeah I was worried I didn't send enough either. I'm contemplating sending more, but someone suggested this could just confuse things. I'm not sure what the best thing to do is. If it saves a delay in going for a interview it's worth the effort.
 
I suggest you to send more, people do that often, not a lot but if you have proofs of your vacations together and pictures its better to do so.

You have nothing to lose.

If you will get a delay becouse of it or an interview convocation that its not always becouse of less relatioship proofs, could have different reasons as well, like a recently divorce, years of travel history, differents of age, culture, religion....etc, no one really knows for sure.

Good luck!