I don't mind going into the 80s and that's because almost 100% of users on my auto are actually frequent posters and since I'm a daily manual curator, I use a lot of my VP. 

I think you have a healthy voting culture, I want to have something like this too but sadly I can't eat my cake and have it. Since you're careful never to hit 100% I think that's healthy. 

I hope you can find more active users to curate or add on your auto. I think these set of creators makes sure you never hit 100%