Perhaps amending to that a filter to that which gives less upvotes for submissions that are repetitive based on url, page title and article keywords during a certain period of time. Though the only problem with that would be if early submissions are of less quality and get upvoted while ones that come slightly later are of higher quality.

I would go for the brute force approach - write your own good articles, write your own good comments.

Otherwise, its just "hey look world this one is interesting" with nothing back