I get random juddering/stuttering when rotating and general maneuvering when near stations and stars. Its not all the time and its irrelevant of what graphic settings are used, sli disabled or enabled, tried all NVCP settings with various max frames, vsync on/off etc etc. At first you dont notice it much but after a while it starts to really annoy.
I have EXACTLY the same issue!!!!
Try disabling SLI and see if that helps. The game isn't the smoothest going and I run G-Sync and still notice the occasional stutter but that is more to do with jumping in FSD.
He just said he gets it with SLI enabled and disabled... I get it too and I don't have SLI