Other idea for ya for the DCs.
You are using torpedoes. So presumably they are auto-loaded, OR the player can drag them to each "tube."
Assuming you cannot make "set depth" work, make several DC types. They all look identical, and make the names that show up to the player identical.
Each has a different proximity setting. 1 type is set to 1-2 m, another the 5m you have now, another to 10m, and perhaps one to 20-40m.
Now, you dump DCs, and some go off without the possibility of damage, some will shake the sub, others might blow right next to the target. Ideally they'd be loaded sort of randomly on the racks.
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