On normal game speed i get the wins between 350-400. I tried some other civs but so far i could not get an economy going that would keep me in the game with my settings. I think the main problem is that building settlers is so expensive.
I started writing a walk-through but i am not done yet.
There are several civs that can compete economically with the Kurios IMO. All of the financial leaders (Flauros, Arturus Thorne, Hannah the Irin) get a great boost to commerce, and their civs are already set up to perform well economically.
The Lanun under Hannah have explosive growth, even on pangea type maps, as their is almost always a shoreline to be found somewhere. Now, on a map that has absolutely no water whatsoever, they would certainly be at a disadvantage, and much of their strength would be lost. Even then, Hannah's financial trait will still generate great riverside bonuses, more effective plantations, etc.
The Khazad have huge potential when it comes to economy....their production is pretty much unmatched, and their vault bonuses help immensely.
The Calabim also can generate high production (due to governor's manors) and great commerce, at least under Flauros.
I'll admit the Kurios are good, especially on smaller maps, but I think the Calabim, Lanun, and Khazad could compete fairly well when it comes to economy.
This has been my personal experience anyways.