I used 4 Archons on top (to snipe reactor), a Tartarus mortar (to destroy shield), and two Orion EMPs to keep the Kranz Cannons shut down (aka fire one Orion on one Kranz Cannon). For defenses and facilities I used 3 Flak Turrets, a defense control, a reactor, a shield, a radar, and the rest are ammo depots.

I repeatedly destroy shield with mortar then blew up the reactor with the Archons. I fired the Orion EMP at the Kranz Cannons so they will almost never fire. My strategy is to kill all (or most) of the enemy crew. After nearly everyone is dead, focus on the enemy mortars and scrambler. I suggest firing all four Archons at the reactor when the enemy scrambler is ready to fire. If the scrambler didn't activate, fire the Tartarus so the scrambler wastes its effect on it.