In order for your visual stadimeter data to be reasonably accurate you have to be within 2000 yards. It just isn't in the cards to begin gathering data that late, so set your priorities on speed and course of the enemy. Knowing his course is knowing his AoB so that gives you everything but bearing and range.
Bearing changes rapidly so that will be the last input before you fire. But range is critical if your torpedo track angle is more than 20º. Plan for that bearing to be under 20º and make sure to get a last stadimeter range at under 1500 yards. That should get you close enough if you fire from 500 to 700 yards away.
Playing with map contacts off is not realistic. It is difficult. Real captains had the benefit of a tracking party that gave them all the info you have on the TMO nav map. I think that is the closest to reality we can get. Going with map contacts off deprives you of critical radar information which our poor radar screens and lack of measuring and TDC input tools can't handle by themselves. Playing with map contacts off is like crossing an eight lane freeway blindfolded. It's difficult. You might just succeed. But no sane person would do such a thing. You get difficulty kudos but not realism points there.
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