This is basically exactly what I think is needed except I'd coin the option of letting people choose how much MVEST out of their total MVEST pool goes to a witness they vote.

Indeed a mechanism should be in place to choose the percentage to allocate.
But since I had a small witness running(I shut it down for now as the Civil War stalemate progresses). Perhaps setting a minimum of 1%for each witness, which would put an automatic limit to 100 witnesses each profile can vote for.

When voting for 100 witnesses, it will have to evenly distributed while less witnesses voted gives the profile higher ranges to choose for each.

You have to agree that a system where each profile can cast 33.3% more equal votes than positions in the "Security Council"(top 20). Of course it was a matter of time before a centralizing entity could buy a lot of Steem and set the whole Security Council with his minion-witnesses.