Only prototypes were available that early, and given to a very few boats to test, but I guess you could regard yourself as one of the lucky test boats, so it is 'sort of' realistic to have them that early.
Incidentally, it was recommended at the time of those tests to place the acoustic homing torpedo only in the rear tube, so that you could run away from it, also as ReM points out, diving was common practice too in order to be below the 'floor' of the seeker (a common practice with torpedoes today in fact).
It was noted at the time that they were unlikely to be 'miracle weapons' as there would be many occasions where a standard convoy engagement firing position would not be conducive to use of the acoustic homing torpedo, so if you are having problems employing them, that's realistic, as the real sub skippers faced that too.
There's a lot of useful info about their use and capabilities in the book 'Type VII U-Boats' by Robert C Stern (ISBN 1-86019-855-4), which I thoroughly recommend if you are even remotely interested in German submarines, as it is a mine of information, and in fact one of the 'modders bibles'.
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