Hello Rob
I think you get transfered in French bases after the fall of France (June 1940), but I don't remember the exact dates. In any case between June and August 1940 all French bases become operational.
I'm affraid I can't quite understand the AA question. If you mean to get the double AA machine gun I think you can do it at any time. If you're talking about getting a second flak position in your boat it depends on the type of U-Boat you're using. I would suggest you check the ? (question mark-help) icon in the U-Boat update screen to see when the different updates become availiable.
I've never used the HI mod, but if you give me a bit more info about it I might have a look and come up with a suggestion.
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