Just to follow up on this in case anyone ever sees the same issue...
The offset picture was 100% a sync issue. I broke out the two sync pins from the 6 into a 3-pin connector, and the picture was perfectly aligned. Also eliminated any curl.
I had another neckboard lying around, swapped that and it turned out that fixed the lack of blue as well.
Thanks for the help Grantspain - you set me looking in the right places.