This is rather interesting as I had considered another approach. I would think that raising the Top 20 to 40 would improve distribution and security. While this increase could lead to less consensus, it could lead to more involvement of the witnesses which I would say is needed. In order to ensure more governance, I would say that sub-committees among these witnesses are created to establish governance of certain factors like security, development, economy, treasury, etc. However, as you mention, the great things about this system is that we could propose and work through the best approach that leads to the best interests of the community in the long term.