This is an awesome initiative. So many active and engaged steemians that go for the most part unnoticed or undervalued. I think what you have is a great starting point to have.

This would be really hard to do, but would be interesting to see a creation vs reward score. For instance if someone is making great posts consistently, but getting very little rewards to somehow bring those accounts to the front as well. Maybe tie this into account age as well, so for those that have been around months/years and barely make $1/post can get some more publicity.

I assume this would be extremely difficult to do / manage, but you asked for suggestions. Best of luck.