70 downward angle in DW ? Now you really must be playing some special mod.
Anyway there is even better maneuver. Don't get shoot at. Torpedo evasion means you failed. Sure, it will happen often in the game, but you should always think about how to avoid that.
But otherwise I agree .. getting away is often everything you need. Sure, if you get torpedo dropped from 3 miles, drop as many CMs as possible and do your 70 degrees trick (if you can), and praying is good too and screaming usual.
But if it is regular torpedo running at you from some distance, especially those cheap'n'slow Chinese stuff .. simply run.
It's good tactic in FFG too, as it has no CM (that towed one is mostly useless). But in FFG you can avoid being shot at more easily, as it has helos.