I think it's just chancy in GWX. I've seen fatal secondary explosions in T3s from his under the bow, the center, and the stern. I usually go for the stern, because it is so vulnerable in T2s and I fall for the analogy. Somehow I suspect that the bow area is vulnerable in T3s - like there is some explosive fuel carried there. I seem to get a lot of secondary explosive-kills from bow shots. With T3s I always set my torps to 11.7m depth. Works like a charm.
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