I think we need cultural shifts here on Steem.
Off topic in a way, but not, but is, but isn't - but hey, you asked for input...
Make something long the lines of capthca a requirement to upvote or downvote.
It solves all the bot/circle jerking autovoting, and means people have to make the effort to support (or criticize)
Using you SP, to 'support' or criticize, require no effort - or cost.
Making people 'work' to support makes it all very much more organic.
Use technology to enhance the human the experience, instead of letting technology mold us...
It sorts the wheat from the chaff, the lazy from the intentional.