If a maker is not supplying support we've had to change to the maker and products that work. Samsung has been mum about a lot of settings in the service menu so as you, we can't rely on them.
I have a 3x3 video wall. There is a control controller that outputs a video signal from each output to each panel. And when the image is displayed between the top and bottom panel, one video catches up with the other. This can be solved by adding 1 frame, but how to do it in the UD55 series panels, in which menu to look for it? Since we checked on the panels from Panasonic and they can add 1 frame, and the image becomes perfectly smooth, between the top and bottom panel.