Mine is
-2 Graviton Beams in the back to kill pesky fighters and frigates
-7 Burst PD lasers dotted around the ship
-8 linked Heavy Antimatter Blasters
I come up to an Onslaught and in one volley discharge all 8 blasters to overload the shields and bring the hull down to 5-10%.
It does eat up all of my flux
But hey who cares about ammo when your shots are overkill right?
... I do switch them to alternating so i can fire single shots against frigates and destroyers
Another variant is to replace all PDs with small gravitons.