The additional benefit of the (standard) Fast-90 method is that impacts on the same row occur simultaneously when torpedoes are fired as the target passes the optical line one after the other. But that requires the rows of a convoy to be perpendicular to the convoy course as well. Which is not always the case in Wolfpack I noticed. The gyro angle being 0 allows to aim at all columns with the same settings.
In this skewed case you need to be turned to the target course at the same angle as the skewed rows. (so they all line up again at impact time) And then it would rather be properly called the Fast-Any method.
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