I think you forgot the convoys from sz 6 on your newly acquired Korea.
J2:
44 IPCS:
Purchase:
1 Minor Factory - 12
4 inf - 12
2 art - 8
2 tanks -12 = 44
Combat move:
Walk in Sui, Hop, Kwe
Attack Yunnan with 4 inf, 2art, tank, mech, 8 figs, 7 tacs
Rolls: 3@1 4@2 9@3 7@4; Total Hits: 123@1: (3, 3, 5)4@2: (1, 3, 6, 3)9@3: (6, 2, 6, 4, 2, 2, 5, 1, 2)7@4: (3, 2, 4, 6, 2, 4, 4)
vs. 8 inf
Rolls: 8@2; Total Hits: 78@2: (2, 2, 2, 2, 2, 1, 2, 4)
Move 2 BBs and 2 Cruisers to sz 6, pick up 2 inf 2 art from Japan amb assault korea, attack with manch units, and jehol 3 figs and 1 tac and 2 bombers from Kwang
AA guns shoot
Rolls: 6@1; Total Hits: 16@1: (4, 4, 3, 4, 1, 2)