I would have kept three styles of submarine warfare :
The wolves packs
First of all I would have set a complete different communication system. With only one way long distance communication, from BdU to u-boat. It was almost useless for BdU to get repport from the wolves but really dangerous for the wolves to give them.
I would have work on a special sub model to work as sub BdU on the wolves pack level. Each wolves would have been asked to make repport on a short communication radio to the special sub every 2 days and the special sub could have send grouped pack's repport to BdU. As this sub would have been nothing more than a mobile radio station, my priority would have been to make it as sneaky as possible... forget about offensive potential.
The suppressing warfare
I would have had a fleet of sub with minelaying capacity with the only mission to set mines on every port when it's possible (maybe 10 modified type VII).
I would have had a heavy mining campaing into the med, not to suppress the ennemy's port but to make any landing on europe by med hazardous even before the troops landing.
The long course warfare
Donitz dislike the type IX and the way it was use to hunt solitary ship. I would have use them on a specific hunt. Tanker on the other side of the ocean without any communication from the sub. No repport before the journey back.
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