I think the bigger ships in sins should have more turrets on them, BUT placed on each side. so you will have to manouvre around and line up your guns. as it is now, I think the capitol ships has pretty few weapons for such a large ship.
and it could have its more heavy weapons mounted to the front, and those should only be able to fire straight ahead, like the laser attack now can shoot almost 90* from its turret. It should only be able to shoot straight ahead.