Congrats on getting those long Shots in on target.
My main concern about what you mentioned in your post is that Convoys have a bad tendancy to change course/Speed randomly without warning especially as you mentioned you had already attacked them, plus i would not hold any Values about speed and course sent to you from BDU as Gospel.
As i have found out in my workplace trust nothing about what anyone tells you, find out the information you need first hand by yourself then you know you got the right data.
Especially if you are running GWX3 as the convoys twist and turn about like twisty turny things. Lost a couple of convoys trying to jump ahead of them because of this,
Good Hunting!
