It seems like from your two posts (I assume they are similar games if not the same), you are running into the same issues.
I get the feeling you are going all in against Germany. The Percentages may exist, but Germany is best taken down in either 42 with the transport train. You may get lucky, and think that’s the norm with your all out attack, but you have to wear down Germany.
You mentioned in the other posts that Germany had 60IPCs. What did Japan have? You have to have the US/UK nitpick at the German defenses and production. Africa is helpful, but you have to slow down the German advance into Russia. Pick a route, but you need to ensure you leave yourself options without falling for easy bait (don’t land troops somewhere just so they can get obliterated).
You are trying to open holes in the German defense so Russia can enlarge it. Don’t get greedy with land grabs until you know you have the forces to back them up. If you have a large stack and are going to take 3 territories, you better be able to hold on to those and be able to launch a successful attack the following round. Sometimes you need to accept that two or maybe just the one is what you need.
This isn’t probably what you are looking for….but Merry Christmas!