[Urei]

Most probably a Ghost Version adapted to Space Combat, thus exceeding with maneuverability and mobility over the test type X9.

Ghost X9 is an old version and I'm positive many improvements were developed for space combat, thus the 'S' in their name. Fighters in Macross can handle huge G Forces thanks to their construction and materials used. The gravity control systems most probably let pilots handle big portions of those G Forces while piloting but there are always limits.

The A.I. of Ghosts is their main point of value. Only an incredibly advanced A.I. can handle real time tactics, maneuvers and predictions of battle development. Ghosts may have advanced in structure but they will always be as good as their A.I.