This is funny cuz i used SH3 Commander to change the PQ extra to ET for my U-69 to hunt at the right place for my time of career...
I did'nt dare to try to raid Freeport cuz too many Armed trawlers but a great convoy came out to play with me
For the fuel problem, try to refuel at canary islands on way back.
But SH3 Commander really is great and a must. You can also use it to make yourself target PQ's in interesting places (like invasion of norway or operation dynamo etc.). It's the perfect add to GWX.
Gute Jagd und fette Beute!