Oh, I did mention convergent linear (or something similar) above. There has been another suggestion thrown around that'd be less disruptive to micro votes while keeping the spirit of convergent linear's purpose in deterring microfarming. This is the "flat tax" solution. Instead of convergent linear's 100% "tax" at the beginning of the curve (which regresses along the curve), the "flat tax" solution just begins with something like 50% "tax" and is applied until a certain amount like $1, and this capped amount carries on linearly from then on, just enough to discourage microfarm and encourage curation, while also not screwing over genuine microvotes/interactions too much. Yeah 50/50 is likely, it's one of the requirements to encourage curation, even if naively increasing the value proposition of SP by itself.

As for downvotes, it'd definitely increase the level of toxicity, but there's also another side with increased curation rewards that make it less likely that downvotes would be used far too blindly as there are better incentives to also play nice and work together as well (while not doing too blindly as well because of the possible downvotes).