I think that the reason so many people get googly eyed when we talk about the "stupid DD AI" is that there really isn't a widely available DD Evasion guide out there. There are mountains of guides on how to actually make a torpedo hit something. But after that info gets quite thin. Learning to evade DDs is mostly a self taught thing. I think that what we need to do with GWX is release something like a strategy guide.
What I can give you guys in the interim is a little synthesis of commonly accepted wisdom amongst more experienced folk.
Deeper is better (especially in the new GWX). DD ASDIC sensors have a cone and that cone gets narrower as you get closer and deeper. If you can get under him he won't be able to see you and he is blind in his baffles (his arse).
Keep your speed low when deep and accelerate in bursts when you won't be heard or when he is running over you in a Depth Charge attack when he has lost contact with you temporarily.
Use the Bold decoy the moment it is available. Effectively deployed it is excellent at throwing off a DD.
In the game you profile to the DD is important. Facing your bow or stern to him reduces your visibility.
That's my rudimentary set of tips. Maybe someone whos a bit better than me can add some detail (like how to use Bolds properly).
Cheers
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