What works for me, but won't work for everybody, is I'll run at surface at high tc when it's clear, and usually the WO will pick stuff up well.
If it's dark/foggy/rough weather, when I run at high tc, the game is smooth, but when it starts to process a closing ship, even 50 km away, it will chop up a little, I will dive to pd and listen in on the hydrophones. Cheap, yes, but effective for long trips.
Note this doesn't solve the fact the probability of encountering a ship is diminished at high tc, but it does allow me to know when to drop tc.
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