Based on your description, the first thing that comes to mind is that you might be confusing port AOB with starboard AOB. This would cause the torpedo offset angle to be behind the target.
When you measure angle on the bow as you described, note the side of the target you are looking at. If you are looking at the target's left side and it is crossing your bow to the left, it is port (red) AOB. The reverse, if you are looking at the target's right side and it is crossing your bow to the right, it is starboard (green) AOB.
Another possibility is the way you are inputing your AOB into the TDC. The target is constantly moving so the AOB changes very rapidly, thus your angle may be wrong by the time you input it. I always use the AOB at the intercept point of my course with that of the target's course. This angle is constant. Go to the UZO/scope and place it at zero bearing. Now, enter the AOB of intercept point. Any rotation of the scope will now yield the correct AOB at any bearing.
Try these ideas and then post again.
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