The TDC already takes this into account. It should show this in a small inset dial on the speed dial of the tdc page. If I remember correctly it is 30, 40 or 45 knots for type 1 torpedoes. 30 for electric type 2 torpedoes. But it's been a while since I played. You might want to reverse calculate from what the gyro angle, periscope bearing and Aob show you.
Be mindful though of a bug which does not update the calculation if you switch to a different tube with different torpedoes speed setting. Always check or use the same speeds.
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