I've not had musch experience in convoy attacks, but I think as far as GWX is concerned it'd be difficult for you to penetrate w/o being spotted.
What I do is to lie in wait ahead of the convoy, at periscope depth, ahead slow & silent running. You'll have to time yor approach such that the escorts come no nearer than say 2km to be safe. Pick your targets, launch your tubes then get out to relaod & recharge before you try again.
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