(UPDATE BELOW) A temporary workaround for the developers of Empyrion - Galactic Survival. Definitely not a permanent solution, but will at least make the movement look smooth for now.
The issue is not very visible in this video since it's only displaying at 60fps (make sure you're watching in 60fps), but you can still see it. If you run this same setup on a 144hz monitor, you'll see exactly what I'm talking about. The stutter is much, much worse in person.
UPDATE: The video linked below describes what is actually happening for which I did not explain. I merely provided a video to help Empyrion developers at the time to provide a TEMPORARY solution, which they did shortly after my posting... BUT they never changed their core movement code as I begged for since the beginning ("Oh that'll be fixed in the beta optimization stage" [RIIIIIGHT]). So I link you guys to a better explanation link below. I hope these guys help you out!
LINK: • Smooth Motion in Unity