In theory/IRL the acoustics needed a faster target 10-15 IIRC I recall reading somewhere that unless doing evasive maneuvers they where all but useless against a merchant.
You said you where at full stop so they shouldn't hear you. assuming your screws are stoped but still have momentum carrying you it could it sees you as being the noisier.
I primarily use acoustics as an ambush torp when I am ahead of a convoy and just sitting waiting for them to come. Even then I prefer Lut and standard T3 torps. I will see if I can recreate this later today.
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