It looks good, but needs a bit of tweeking to make it more efficient. For instance drop the necrotech, you don't need him, and add a second pistol wraith. When it comes to pistol wraiths you field 2 or none. Keep them together and shoot at warjacks. The third shot will cause the movement or action to be forfeit, and with the second PW shooting the same target both his movement and action will be forfeit. Two PW can take a colossal out of the game for a turn or two. That might be enough to win you the game.
Death to the false Emperor!!!!