By saying that you shouldn't use salvos I didn't mean that you should only fire one torpedo per ship
. I fire 3 or even 4, depending on the target. But I fire them individually so that i can aim them precisely where I want. A salvo spread angle can't always achieve that. Plus, you might not have 4 identical torpedo types in your tubes, so firing a salvo might lead to ugly results.
1000 meters sounds much better. I usually fire at around 600 meters on single merchants but at around 4000 on convoys.
Why no adjustable PK dials? Because Ubisoft thought they were making a fancy Doom-clone.