Offhand id say the angle your shooting at is too great.
If your using impact pistols, the angle at which the torpedo hits the hull cannot be too great. The impact pistol relies on a solid hit, not one that deflects off of the torpedo's frontal cone.
Also a impact hit will deflect off a ship if it hits the bottom most portion of the hull where the side curves around to form the keel. Ships this can be problematic on are shallow draft ships like a liberty. In rough sea's id set your depth to 1, or 2 meters, or even 0.
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