A middle ground reward system might involve weighting people's voting power by their rep score, or steem power, or a combination, but it would be far less drastic a weighting than the current whale (10,000) to minnow (1) voting-power apparatus we have now.
I suggested a sigmoidal visibility curve in my post here: https://steemit.com/steemit/@nealmcspadden/account-based-voting-is-a-terrible-idea-for-steem
Yea...pretty much along the same lines as I've been saying too. Well done.
The first formula we try is probably going to have to be tweaked over time, no matter how we originally set it up. The important thing, of course, is that we AVOID one-account/one-vote at all costs, and that we get off the current system. The formulas can always be tinkered with to adjust as we learn what works best for all concerned.