@Yo_John
Actually you have a good system going on. Even if you discount, let's say the top 3 and bottom 3, you will still have some deviations to the actual score. Plus, that will only make people votes even lower, because that way, even if you discard them, there will be a global deviation of the average score due to the aggregation effect it would have on the rest of the votes for people voting lower to avoid being in the Top 3.
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