Thanks for the info. Too bad about the hash marks. I tried installing the Optical Correction mod, but that didn't work, so I'll have to live with this extra inaccuracy. As soon as I have the time, I'll have a look at CapnScurvy's work.
In the "problem case" I was almost attacking straight ahead (apart from the desired spread) and at approximately 3'000m so the parallax issue should not have been an issue. At 75° or (something like it) the IJN Naka (Sendai class) gave plenty of surface. 10m left or right would not have mattered.
Anyway, I got the info how to do it, so thank you. And, more importantly, I sank the command vessel right in the middle of a DD task force
Next is the Battle of Balikpapan, then Battle of Java Sea, then the Carrier Group going for the Indian Ocean and then off to the Solomons.