Take a deep breath -- you're fine! The ad coms let you submit your highest score and generally focus on that (even if they do have access to all of your scores). Furthermore, my understanding is that there's a generally accepted +/- window on the GMAT of about 20-30 points. If your score had dropped 100+ points, it might cause the ad coms to have a bit of concern but 30 points really shouldn't be a big deal.
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