If all you are looking for is action then probably best to take out RSRD as this mod creates a "real life" scenario for the number of ships found, especially in regards to large convoys. Early in the war the Japs did not use a lot of convoys so mostly you will only find single merchant ships.
Also you may be missing contacts by being submerged at night, this is the best time to be surfaced as you will not have issues with airplanes and have a better sight range. I personally run at "standard" speed to maximize my search range and also for best fuel consumption.
You can usually enlarge your search area also, read your orders because it usually gives you a 100 to 150 nm mile search range. If you continue to use RSRD find a map that displays the historical shipping routes for Japanese merchant traffic and stay in those areas when possible when on patrol.
You do not have to ask the AI crew to find targets, if they are their and in range they will let you know.
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