I'm starting to get a little out of my depth here, but I'm looking at version 3 on my (in)famously dark monitor at home. From that perspective, the background appears to be the problem - I'm starting to think it's too sharp - it's a lovely background, don't get me wrong, but something isn't quite right. Perhaps run a slight gausian blur over the back plate (including the bridge explosion - I think the flak is fine) - only a touch, to make the foreground plane the main point of focus - then as Wiek said, start to desaturate the second plane?
Just my opinion of course
