Generally I send 2 ss to SZ 111, 2 to SZ 106, and 1 to SZ 91. Killing the cruiser is nice because it gives Italy a bit more freedom, yet killing the trans & sub in SZ 106 is more important IMHO because it slows a canadian reinforcement army and gives your subs more freedom as UK will only have 1 dd. SZ 111 is necessary because you don’t really want to trade airforce for a bb and dd, especially since UK will likely scramble because you have no way of soaking up hits, while they have 1 free hit.