Well, given that situation I only see two real choices: you can either move away submerged and be content to shadow them until nightfall when you can safely run on the surface again, or give up on the target. With the escorts both having an idea where you are and staying around the target, you can't engage directly without extreme risk. The planes will prevent you from using the surface to go around and get in front of them again. If the convoy is still running slow, you can remain submerged and keep up with or even pass them sometimes, but you'll have to evade those DDs first.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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