If it wasn't a Gravitic Command Station, I would say Spire Blade Spawners. Since it is, I suggest Ninezul Railpods and Mobile Space docks. Move the MSDs to the opposite side of the gravity well, and then turn them on. You weaponize your full economy and it does a terrifying level of damage to anything that isn't Sniper Immune, especially if you have MK I-III unlocked. Mark IV and V just make it even glorious. There is a reason I get at least one of those two ship types every game, if not both.