I don't think you need historic literature on the subject to try non-90 methods.
The 90-degree method is the most reliable, primarily because you control the tactical situation. You overtake the ship/convoy, lie in wait, have sufficient time to make calculations (plus double-check), and the entire length of the ship is your margin of error in case you misjudge slightly.
If you don't have the tactical initiative for a 90-shot, then time is really your only enemy. Well.. that and the Allies.
Non-90 attacks don't involve different TDC knowledge; they just take quicker thinking, good grasp of your surroundings, a lot of balls, and some luck.
When you're comfortable enough not to second-guess yourself every time you turn a TDC dial, then feel free to experiment with more 'creative' attacks.
Good hunting!
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