J1 DOW, take FIC and Kwangtung.
J2 place Minor IC on both FIC and Kwangtung.
J3 Mechs
J4 Armor
J5 Attack if odds are good
J6 Attack with better odds and multiple ARM left to move to the Middle East.
Allies have a hard time dislodging those two IC and they provide support to turn off China while also being able to be in position rather quickly to supplement the siege on Calcutta.
I actually go for 3 minors with a J1 placement in Kiangsu as well - because the strategic ability to seal off China at Jehol is rather valuable with the Russians / US moving into Manchuria / Korea.
In the long run its cheaper to build on the mainland than try to protect SZ 6 from the US (or break a US blockade) and in addition, placing ships at FIC or Kwangtung really pushes back ANZAC / the US from the DEI and Flip.
Since discovering these placements via Grasshopper’s Japan walkthroughs, I have rarely had issue to SBR Calcutta. Sometimes, I even leave Calcutta sieged without taking it right away because they cannot break out and simply leave SS to convoy what few IPC they can collect.
Sometimes its better to go for ANZAC’s throat or a decisive naval win in the Pacific because the Allies are racing to catch up and leave themselves exposed trying to protect / secure Calcutta. Those minors will eventually produce enough ARM that you don’t even need to use your airpower to defeat them, so putting them to use to decisively secure the Pacific from the US Navy is worth the wait.
Like… who really cares about 5 IPC when you’re making 60+ and can put ANZAC on its heels because you immediately turn around and sink naval purchases and it only has 4 INF and two turns to purchase ARM to try to protect Sydney?