Not enough light bounce

Hi, I want to improve my lighting skills.

I am having trouble with very dark areas in my scene. There seems to be no light bouncing of the backrest onto the the rest of the seat or the table. But in the right row one can see the light bouncing of the table onto the backrest of the seats. I would also expect the wall on the left to spread more light since it is clearly over exposed. Light bounces is currently set to 3 out of 4.

Any ideas are very welcome.

 

Progressive lightmapper doesn't bounce well. Try Enlighten.

 

Thanks for the advice.
I have baked this scene a few times now. Wich isn't easy because the render time has quadrupelt.
And the result is not that pretty either. I seam to have lost all atmosphere and why are all objects lit differently? The scene has only one directional light.
Any ideas?