The mods you installed significantly alter the stock shipping lanes and number of vessels. This was done to more accurately depict what was historically eencountered by our boats during the war. Most of the patrol reports I've read from the first few months of the way only had a handful of contacts.
Surface patrol, as our CO's discovered during the war, was the most efficient method for finding contacts. The sonar of the day was not very good, and the sound characteristics of the pacific changed dramatically. The greater speed of surface patrol with a sailful of lookouts spotting smoke from ships funnels made contacts easierto locate. Unfortunately the lookouts in game seem to have a max range beyond which they are blind. I tend to believe the soundman has a similar limitation as i have picked up contacts manually that the ssoundman didn't find. I am unsure if crew with better ratings would improve this or not.
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