An update on this.
I've made changes so that it's possible to highlight posts based on reaction count over score. The system is going through and fully recalculating reaction scores so that if I feel the current metric is inadequate, my backup idea is ready to go. It's going to take several days for the database to finish going through the entire body of posts on the site. I've had it running for a few hours and we're only at 272,739 out of some 5.7 million.
You should already be seeing the new highlighting preference and it should include horrifically bad posts. It won't be drastic but I'm hoping it'll be more entertaining than just "good" posts.
Tomorrow I'm going to work on the less noticeable moderation/backend chore list and once I'm happy with everything I'll figure out how I want to do "jump to next highlight".