I just finished a game where I only played against the Corporate Sector on Godlike setting.  I lost on turn 46 via Prestige Victory and I hadn't even met them yet!  I know that I had complained about the Prestige calculation before and I know that you have tweaked the calculation, but you may want to take another look at how Prestige is calculated.  No civilization, even under Godlike setting, should be able to win a Prestige victory in 46 turns without even meeting their opponent.