I use Edius too. Same export parameters as you except I use VBR with max 15Mbps for 720p and 25Mbps for 1080p.
On pc the video is perfect but on TV I see a lot of compression artifacts on all dark area not covered by your powerful lights.
I think there's nothing to do. Maybe trying to increase the bitrate but sometimes the vimeo encoder sucks in low light
BTW a little bit OT. I found that using a canopus HQX superfine 10bit project sometimes helps with color correction and maybe in the export too.