Proposal for fixing Reputation system

I was affected with negative reputation for past post before implementation, but thanks to kind Steemit users I was able to bring my reputation back to positive.
It is painful to have negative reputation when you have not done anything so bad.

At current settings user with 0.5M vests can drive away user with +1 reputation to -1 with only one downvote that can not be fair.

My resolution for fixing reputation problem:
Add weight cap to accounts with billions of vests.
Increase minimum weight for reaching first negative level.
Add minimum number of downvotes with at least 1M vests to affect users reputation.