AO in editor != AO in game

Hello again,

I am having some trouble getting the Ambient Occlusion to work correctly in game.
In the editor I get a very intense AO :

http://puu.sh/hZ9nz/f03cc92265.jpg

And in game :

http://puu.sh/hZ9oj/e22c074946.jpg

As you can see it’s barely visible in game, I am unable to figure out a way to change fix this.

Thanks for your help,
Max