I think, that I would have scrambled with 3 fighters to SZ110 because of the lack of sub fodder and 1 fighter to SZ109.
In my turn I would have attacked the remaining sub(s) in SZ109 with SZ106 destroyer and air to prevent convoying.
Also if Japan holds off until J2 to DoW, but the US player is either dead certain it will happen or hopes to discourage Sea Lion, they can slap a Naval Base on Greenland and load it up with their starting Atlantic forces US1, then drop the troops off in Scotland or Ireland US2. If London is saved at that point, you’re still in a decent position to threaten landings from France to Norway, or even farther if the UK player can be accommodating enough to give you a Naval Base.
yeah…we tried it. I think that’s the first move everyone sees when they set up the board. I’ve recently had to bring additional german aircraft to Tobruk or the UK players plasters that army and Italy has nothing in Africa.