A lot of times Iray's realism comes in the way when trying to combine IBL and lights.
For example, Iray renders iClone lights (spotlight, point light), even if they are hidden.
In addition, also the IBL works different in Iray then in iClone realtime.
The workaround is to either move the physical lights out of the view, or make sure they are not covered by another surface.
The IBL is a different thing. While in iClone, it illuminates the whole scene, in Iray it illuminates only something that it 'reaches', from a phyical viewpoint.
76% of original size (was 665x19) - Click to enlarge
So it is very difficult to find a setup that works with both.
I'm posting this while i'm learning. If the renders are looking good to you, i appreciate it.
Although i know this is amateurish work, i am really happy with some of the results.