Being the largest and popular upvote bot @minnowbooster may have some responsibility too. I think 10-25% to total power can reserved for humanly curation.

Minnowbooster can ask volunteer or hire curators. Users will send $5+1 sbd, (extra 1sbd means- seriousness of the users), it will be judged by the curator. Minnowbooster will vote (5+1)% normally . Provide a better vote (say, double or triple) according to the quality. It will be a curation work by minnowbooster. @randowhale uses 25-100% very rare vote. Therefore, this process will be better than blind voting.

Also, please lower the minimum vote to 1 SBD or 2 sbd vote, it is hard for minnows.

Probably some sleeping on daily basis rather than random to recover some VP.