With impact torpedos, good places to hit them are under the smokestack (engine room) or slightly forward of it (fuel bunker, even better).
If you want to sink them by flooding rather than critical hits, I suggest hitting them close to bow or stern - bow in rough seas, stern in calm. A depth of around 3m should usually be fine, 4-5 for large ships. Draft -0.6m if you want to aim at the keel but I realy wouldn't recommend it in most cases, use magnetics for that.
Impact hits work most reliably at angles close to 90°.
For magnetic pistols, hit them amidships at draft +0.5m in calm and draft +0.8m in moderate seas. Angle on Bow isn't too important, but around 45% is good: the target presents enough of an... erm, target to not miss and the torpedo spends enough time under the ship to go off reliably.
There is no elegant solution for AoBs near 0 or 180° in rough weather.
Stick to the above and you should usually be able to sink most ships with 1 hit and the vast majority with 2.
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