In the happy times mission the convoy is moving very slowly, and therefore makes less noise. There are also no warships running noisy search patterns at medium speed.
In short, this may not be the best mission to get an accurate assessment of typical hydrophone performance.
Why not test it again with some other situations to see if performance remains below what you expect.
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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