As much as I love the aesthetic torpedos have become a substandard option since they are nerfed so heavily by even a small sliver of shields.
This is especially true in PVP, but it applies to PVE as well. Theyre a bit less awful to an extent in STFs since here at least you have plenty of unshielded targets.
1 DBB gives you a nice wide arc fore weapon, and BO3 is great for spike. It also means you can make some use of the 3rd Tac ensign by moving another skill down to make room for BO3, or by running FAW1 in the ensign slot. BO3 you the nukage of the torp without worrying about the damage being heavily cut by 1% shield healing.
In fact the torpedos niche is reduced further by the existence of the incredible kinetic cutting beam.
Its average DPS is equal to if not outright superior to most turrets even against shields, and it rips hulls apart (with a 360 degree angle, unlike torpedos). Unlike Torpedos it is boosted by weapons power. Finally it also has a brilliant 2 piece set with the module, granting a huge boost to weapons drain resistance. This translates to a big damage increase to all your weapons.
A less obligatory suggestion would be to replace another torp with Nukara web mines. Awesome damage and gives a great stun effect. Unlike a turret it doesnt drain weapons power, and unlike most mines they are untargetable until moments before they rain death on their target.