I like the idea, but I also agree current implementation isn't working.
Are there any concerns about rate-brigading? I know this is a big issue on reddit, and we definitely have enough mangry troons hyperfocused on us to organize rate-brigades for whatever posts they want to be most visible in whatever thread. They don't do it now because rates don't really mean anything, but anything those types can do, no matter how autistic, to control the narrative is something they will do.
There could potentially be restrictions on who could effectively upgold shit (T&H status, time registered, blah blah), but that risks creating the kind of autistic power-user class that smears diarrhea all over plebbit. Giving weight to informative ratings over others would be an improvement, I think, but it doesn't mitigate brigade risk at all. And it would probably modify the way people send out informative ratings in potentially sped ways.
Forgive me if this has already been suggested, but what about allowing mods to toggle special improved GoodInfoPost status, but relying on users to report the correct posts in each thread for highlight? That way you're crowdsourcing the finding of the important posts in each thread, which is the majority of the work, and all mods have to do is go "yeh" or "nah" instead of having some kind of insane assigned task of digging through 786-post threads for the informative bits.