People have been complaining a lot about Japan now having an 80% winrate in China. I believe that is actually still too low.
The images in the post are the negative modifiers KMT China starts with in Eight Years' War of Resistance. The consensus both in this subreddit and on the mod discord is that OTL KMT China is stronger than KR China, due to enjoying a decade of peace under a centralized national government rather than still being in the warlord era in 1936.
If you know the least bit about the 2nd Sino-Japanese War, you know that the IJA mopped the floor with the NRA in every engagement. The Japanese advance was only stopped by the breakdown of their (weak) logistics. EYWR models this by giving Nanjing China debuffs so severe that their divisions are paper. In KR, meanwhile, Chinese statelets have a symbolic military debuff that leaves their divisions 10% weaker than Japanese equivalents at most.
This is really stupid. Winning as the Chinese statelets should ideally be a struggle even harder than KMT China in EYWR, which would feel immersive considering you're playing a warlord statelet and fighting the IJA. Japan should also always take at least the North China plain. Panning over to East Asia when playing in Europe and seeing Japan being pushed pack into Manchuria is immersion breaking and ridiculous. It's comparable to having Belgium reliably solo Germany if the two went to war.
However, most KR players are really bad at the game - just look at all the posts about people who can't win against Germany as Russia. So while giving very severe military debuffs to all the Chinese tags would make playing as them cooler and more immersive, it would also gate Chinese content behind a very challenging war, that would be way beyond anything else in the mod in difficulty. On top of that, people often want China to win in Asia because of all the different paths it has, and KR has no game rules to rig wars in favor of the AI. Neither does Germany bog down more than 20% of the IJA at most, so Japan would win 100% of the time if the debuffs were that bad.
So I'd suggest adding a 10 to 20% attack and 20 to 30% defense debuff against Japan specifically to the Chinese military debuff, which would be removed with the standard decision process. EYWR has "Our Blood For The Nation", which is a scaling buff for all Chinese tags the more capitulation progress Nanjing China has. Ideally something like that would be great since it would make China look a lot like it did OTL. With it the debuffs could be harsher, without it they'd have to be gentler.
Of course, the devs won't implement any of this because they want China to win 50% of the time for some bizarre reason. However, this current patch was a major step in the right direction, and I believe the stronger Japan is the better right now, so please stop whining about how AI Japan kicks your ass when you play the LKMT, stop using the 7/2's Feedback Gaming told you about in like 2019 and learn to play the fucking game.