I think you have to give up on the J1 in that scenario. With the Yunnan stack, China gets strong, so you need to kill China first. I tried to kill China first with the J1 but it wasn’t enough for me. Often, a J2 goes well against a Yunnan stack I think. I’m one of the only players that goes J2 frequently but in G40 J1 is so much better because you can kill India quickly. But you kept India alive and a big stack up north which kept my attention divided. Perhaps I should have ignored the northern stack, not sure.
Also, the 2tt landing on Java was inspired and kept me from retaking it, assisting with Japan’s collapse.
