Make sure to update your PK on the TDC, every time you enter a new number Range, AOB, or Speed; you must hit PK to update the data in the TDC or else your torpedo will not have the correct solution.
Pratice using what said above, turn on Map Contact Updates and see what is going on in Attack Screen Map. I was surprised by a few thing myself (the need to update the PK every time I entered a new, better number -it does not do it automatically).
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