If the issue still persists. Somehow the AOB setting or the Target speed setting is not transfered to the TDC. If AOB is still 0 it thinks the torpedo is comming straight for you, and it does not need to lead the target. Similarly, if target speed is set to 0 it thinks the target is stationary, and thus does not need to lead aswel. Using the notepad method you certainly need to press that "Send to TDC" button whenever you have measured good data. You can check what you have entered on the F6 TDC screen. By flipping the Auto update/Manual TDC switch you can even correct any wrong settings. Don't forget to set the switch back though. Make sure you do a range measurement just before you fire. If it is old it might not correctly account for a high gyroangle parallax. The TDC does not update the range when you drag the periscope around.
Opening the tubes does not have to be done right before firing. You can do that much sooner. But it must be done before you want to fire the torpedo, or else the torpedo will be delayed to the party.
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