Nice update. Curious to see how this works out since it can be easily gamed, but glad you are attempting to improve voting behavior. 

I did downvote this post due to self voting it to trending with Steemit Inc stake, not because I disagree with the post itself. Perhaps in the future sending rewards to null would be beneficial if the reason for doing so is for promotion aspects. Otherwise it seems like the type of voting behavior we are trying to avoid.