Oh yeah, forgot this;
Turn Order
A) Axis Aggressors  1. Germany
  2. Russia
  3. Japan
  4. United Kingdom
  5. Italy
  6. USA
From your list on Turn order this one is definitely the best! Germany before Russia, so Barbarossa will have a go. Japan before the UK and US, and the UK before Italy, so Italian East Africa could be attacked…
However I still like this one best;
1. Germany/ Italy
2. Soviet Union
3. Japan
4. United Kingdom/ United States
Have it tested. It saves time and more realistic. Also add’s more team play.