I agree, give manual targeting a try. It's actually pretty easy once you get over the initial learning curve.
1. ID ship.
2. Get range, guesstimate AOB, guesstimate speed.
3. Set tdc to follow target.
4. On the bottom dial, watch the generated bearing to target by mousing over the top part of the wheel. Compare that to the actual bearing to target over time (how long? Depends on how much time you have. Sometimes I'll check the two bearings every few minutes, sometimes I'll watch them continuously, and sometimes I'll watch the tdc generated bearing with the scope down and have the sonar man call out the bearings to see if they match).
5A. If the actual bearing is out in front of the tdc generated bearing, either you have underestimated speed, or are off on AOB - increase tdc speed and/or change AOB.
5B. If the actual bearing is lagging behind the tdc generated bearing, either you have overestimated speed, or are off on AOB - decrease tdc speed and/or change AOB.
6. Make any adjustments to range/AOB/speed and repeat 4 and 5 as needed until actual bearing and tdc bearing hold the same for at least the estimated time of the torpedo run. If they hold the same, you can't miss barring any target course changes or bad torpedoes.
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