Just to chime in here, you seem to have a handle on this.
The attack wheel on your scope has limitations. Once a ship passes the 90deg range AOB... the markings on the wheel do not align. It's hard to explain without showing. When a ship is going away from you, you will have negative or as you say "erroneous" results. With practice you can still get accurate shots, but the numbers will be in the negatives range.
Good luck!
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