I wasn't sure about HF21, to be honest. My last post, written yesterday, was my first post after the rollout. I'm quite surprised that it made $2.35 on the first 16 votes. It has since gone over $3, my first post to do so for a very long time (I don't remember when).
On the jury duty, I made a similar recommendation on Narrative long ago. Abusive downvoting is awful over there. Any time money is at stake, people will find a way to cheat. Downvoting is an easy thing to do, and everyone knows if you downvote the next guy, that increases your own rewards. The jury system is a good idea, but I'd use more than three jurors. I'd use 24 and make the decision contingent upon a 2/3 supermajority. All the jurors should be selected randomly and are anonymous. They can't communicate with each other during the adjudication process and each arrives at their own conclusion based on the evidence presented.
RE: HF21 + Anti-Retaliatory Downvoting System (Proposal) = A Functional STEEM/Steemit