sabreto; When I first got into this game escorts were a pain and I tried to tweek all kinds of things.
Here's the deal; "Read the Manual".
After I got to understanding the escorts in GWX I looked for a new tactic for attacking convoys. Now, I'm sneeking right into them up to late `42 and sometimes sinking the cruiser inside protecting them. I know that past `43 this will change, ehh so what.
That whole rush in and attack deal you see on Das Boot, forget about it. Use the tools on the map screen, beware and plot the escorts inner cone. Also if you do make a mistake, even just one, ... remember it's just a game