Surface attack at night: move in with decks awash (about 7,5 mtrs deep) and you can get REAL close without being detected....you have to time your approach a little in order to avoid the escorts though...
I even managed to get inside the convoy without being detected a few times...
Give it a try.....
About the sinkings:
I agree that the torps should be a tad more powerful....it takes too much torpedoes for a kill; but you can always get off a shot aimed for the bow which is very effective....going for engineroom or funnel hits used to work wonders in stock SHIII, not so in GWX.
__________________
Daddy cool 
|