Yep, not the 1st time I've had a similar situation with the Nelson aswell - out of 2 attacks and 8 fish only 2 actually reached her, 1 missed and the other bounced off.
As for last nights attack - I was so pleased with myself after intercepting the convoy at exactly the time and place I expected it to be that I guess I got a bit greedy and took shots at around 75-80% AOB on both ships.
Oh well live to fight another day!