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Unfortunately, I am not overly familiar with the site usage, I just new that it existed. If you know when you posted a particular video, you could scroll down to the very bottom and select a previous page. Then look at the dates on the traffic to determine if you have to go back even farther. Once you find the page with the video that got down voted, you can then focus on working back forward in the list until you find the entry with a down vote. Please refer to this post, as it is what tipped me off on the statistics website. https://steemit.com/steemit/@stefanarud/whats-up-with-these-downvotes

I was able to use the CTRL-F (find) feature of my Chrome browser and on page 12 of your history, I found several "downvotes" on the "if 60 minutes..." post
I find it very interesting that they are all part of the same group that downvoted The Dollar Vigilante post a few days ago. Steemit should be able to rectify this. These accounts have been doing a lot of downvoting the day they hit your post, because they only had 47% Steem Power left available that day.

Also you can search the same site for your specific articles, and it lists all upvotes and downvotes near the top. https://steemd.com/news/@sgtreport/did-clinton-and-podesta-order-the-murder-of-seth-rich