Another thing to try is if you are shooting more than one, switch to salvo and set the spread. I know I also have the same issue sometime with the auto targeting. I'll set up on the bow and invariably the torp will hit amidships even with the tubes open. Wave conditions I believe can affect accuracy too. If it's stormy with big wave troughs the topedo actually is out of the water surely slowing the time of impact slightly.
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