Pixels and terrible banding in dark areas - youtube compression

Hi,
I know that the topic has been discused plenty of times, but I wanted to have a confirmation from you that what I do is the maximum I can get from youtube.
In the link below you can see a few shots from our music video - it looks great on vimeo, but when uploaded on youtube, you can see some huge pixels, banding and generally bad quality in areas with low light. I tried a number of compression methods and tried to crush blacks a little bit, but the effect is still pretty bad in the shots with little light. My current settings are (using compressor): h.264, auto bitrate and keyframes, frame reordering unchecked, original frame rate and resolution (video shot in 720p). This is what youtube recommends on their website. I'm using noise to cover banding, but youtube doesn't seem to work well with it.
The link below has blacks lowered already, but that doesn't help too much. Any thoughts? Please let me know!
http://www.youtube.com/watch?feature=player_embedded&v=xCgw_OW2wAI

Thanks a lot for the hints, I didn't know that a color profile can be added just like that. Still it seems that my automator is too old, as it has only SD, PAL and HD color profiles available (screenshot). I guess I would have to install the new OS to get the new version, as it doesn't have an update function... Just to see what it does, I've uploaded the pro res version with HD color profile added; same story as previously -> http://www.youtube.com/watch?v=z8Pc3wzcVrw
This is the vimeo version --> https://vimeo.com/63016609
You can still see some pixels and banding issues on vimeo especially when you look for it, but I think they're not that distracting and quality is way better that youtube. Another thing is, on vimeo I could only upload video up to 500 MB, while the initial export I used for youtube was above 1.5 GB. Not sure if the better source file would perform much better on vimeo?
I guess the video itself is quite an issue for online compression as the scenes are pretty dark, with blacks "blown out" and white flares that make banding even worse. But without these, that would be a different video, so these things have to stay and it would be good to make it work on youtube .

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Message was edited by: K E I added some extra information

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