Thanks for the advice guys.
I've got a perfect constant bearing solution, 90 degrees to target track, and opened all doors prior to firing. Speed should be good, been tracking them for hours. About 1500 yards in range.
I will go to external view to check it out, although I'd usually prefer to maintain some realism. Hope to find out why I'm missing!
In one of my retries, COMSUBPAC actually told me 'good find, break contact, we'll take care of it, rtb at your discretion.'

Like hell I'm doing that!