It's like fishing: if you toss your line in an area where there are no fish, you aren't going to catch anything. You have to go where the enemy ships are in order to hunt, and the exact areas and strategies can be heavily dependant on what mods you are using. The Run Silent Run Deep Campaign mod is great, but it drastically reduces the amount of ships out there, so it'll be a lot harder to find targets if you're running RSRDC than if you're running the stock game. I haven't really tried out the U-Boat campaign so I can't comment on that.
I find the most targets near the coast in certain areas: east side of Japan (especially near the Bungo Suide), the openings into the Sea of Japan (Korea Straight, La Perouse Straight, and the narrows between Honshu and Hokkaido), both sides of Okinawa and Formosa, and sometimes running the sea section in a triangle formed by Formosa, Japan, and Guam. I haven't done much hunting in the South Pacific so someone else will need to let you know what are the high-traffic areas there.
As to how I find them, it's just luck. If you have surface search radar, stay on the surface and use it. If you don't, you need to be submerged and use your hydrophones.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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