My 2nd attempt (Wang 1210 AD) built the UN in the minimum 2 turns (1 for chopping, 1 for buying).
My first try (Hannibal 1190 AD) used a GE, so it was only 1 turn.
So Ragnar's game could have been ~1050. I'm thinking sub 1000 for my last try. And I think we agree that would be Mansa.
Regarding the 7 AI. True, it's good for tech/cash trades, but it also slows them down (crowded). It also makes your UN opponent and any of his friends smaller. 8 AI might slow them more and help you get Physics from Liberalism easier. I really messed up Wang's game and took Printing Press
Wang's UB should have made him the best of those 3 leaders. I think all my maps were equally good.