I prefer the 8" guns for ship to ship. Once the enemy CV group is spotted, zoom in as closely as possible...which can take a minute or two if your CV is turning. As the guns are raised for longer firing solutions (8k - 15+k) you need to compensate your view angle. Do this by hitting F8 and then using keypad 8 or 2 to raise or lower your view. Now it's simply a matter of ranging in your salvos. CV groups racing towards each other close distance quickly, so you'll need to keep adjusting the KP 8 & 2 to maintain the visual.
There's more thorough info on this, and land mode gunnery in H&T. Keep digging or do a forum search.