Hi,
I can not speak from experience since we have not had our CR-1 interview yet, but I have heard that you should not need to present your AOS forms at the interview if you've sent them to the NVC already.
We were worried about the same thing but we've been reassured from posts on this site that the AOS shouldn't be asked for. Although we'll be interviewing in London, I would imagine it'd apply to all embassies.
Still, nothing beats the advice of someone who has been to the embassy where you plan to interview. I just wanted to offer my bit. I hope this helps a little.
Best of luck,
Scouseredneck