From early 1944 on, you will find it very difficult with some convoys. So far the hardest seem to be those protected by American escorts. The instant your scope breaks the surface, they will start heading for you at top speed. They also are much better at detecting your boat as you lie in wait, so you need to stand off at a greater distance.
I attack the heavies and try to use the convoy as way to make it difficult for them to get on top of me so I can dive deep. This means heading into the convoy and running in the same direction for a bit. Funny things can happen at this point. I've seen aircraft sink merchants and escorts while trying to get to me, then the other escorts will shoot down the aircraft. I think this is a bug.
Another thing to remember...it seems the tankers are harder to sink heading west than east. My guess is the developers modeled the tankers being empty on their westbound trips, making them more buoyant.
scrapser
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