Interesting!
Well the best part is, you can never stop self voting.
Messing with curves probably adds more harm than anything. Whatever is incentivized will happen.
The only thing is for people to get over the hump and start flagging when the feel it is right.
My post inspired by this thread might be of interest:
https://steemit.com/steem/@kyle.anderson/subjective-proof-of-work-some-rational-comments-on-the-self-voting-trend