I don't use SH3 Commander, so I can't help you there. As to torpedo depth in GWX, it really depends.
If possible, you want to use an impact pistol. They're more reliable, but for obvious reasons you don't want to launch them under the target's keel. With an impact pistol, you want to line yourself up at as close to a right angle to the target as possible. If the angle at which the eel will hit the target's hull is too acute or obtuse, the torpedo may glance off rather than detonate. For this reason, you also don't want to set it to go too close to the keel, where the hull slopes too far out of vertical.
Of course, if you're aiming at a capital ship, you stil want it deep enough to avoid anti-torpedo armor belting.
In general, I like to go for half of keel depth with an impact pistol. I find I rarely have failed detonations, and when I do, I blame the torpedo itself.
If, however, you cannot line yourself up so that you get a shot relatively close to a right angle, then you'll have to settle for a magnetic pistol. This is dangerous chiefly because magnetic pistols are unreliable, especially when shooting at a smaller target, when very far north (or I guess south, but why?), or during a thunderstorm. When using a magnetic trigger, you want to be a couple of meters under the target's keel. Depending on how the seas are, be prepared for whatever part of the ship your torpedo passes to be either riding high or low in the water, which may result in a fairly ineffectual hit, or no detonation at all.
So in short:
Target is heading at a right angle (ish) to you: Impact trigger, not too far down the hull.
Target is heading more away or towards you than not: Magnetic trigger, under the hull.
Target is a destroyer heading nearly away from you in a thunderstorm with galeforce winds north of Norway: Save the torpedo for later and leave before he sees you. Impact's not an option and magnetic will blow up when it feels like, which is not likely to be when it's under the destroyer.
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