I'm not sure why people want to make some of these changes (leaving aside a minimum balance scope). Why shouldn't naval empires fall off late game? The focus of the game is land tiles. What's the matter with certain buildings being less used? (But do we have data that the Security Bureau and Intelligence Agency are under-built?) What are folks trying to achieve by taking 20 hammers off the jail price tag? Players in the late game tend to have city visibility of at least one opponent. A jail buff would make more city visibility possible. Is that what you're going for? Otherwise, I'm not sure why the change.
There is no way to peace. Peace is the way.