Drawing attention to a specific user and their detrimental behaviour

[Niverio]

I agree some actions would be warranted. Without pointing fingers, perhaps not publishing ratings until after 15 and dropping the top 2 and bottom 2 ratings from the calculations would be a prudent approach.  IT wouldn't totally eliminate the issue but it would prevent one individual from successfully making the whole community look bad. The downside is it would mean more puzzles may never see a rating.

I personally think that taking action against users known to be doing this intentionally is way easier than to adjust the whole system around their behaviour. That is one of the main reasons why moderators exist in the first place, to keep the existing system fairly stable against any possible dangers that might expose / threaten it.