I'm having the same problem early in the war where I departed from Pearl Harbor towards the Marshall Islands. I have found a single corvette patrolling on a totally illogical route, first I thought that it was protecting a much bigger convoy, so I let it go and headed towards the opposite route, but I found nothing.
At the moment my impression is: you could find traffic everywhere by chance or not at all, but the chances should (in theory) be increased on historical routes that you are not supposed to know! You can know about routes if you launch the Radio which comes with a giant map listing all important convoy routes in the war and even enemy air coverage.
FORTSU is said to have much increased traffic compared to TMO, that must be true but I have yet to see that.
XS
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