Hearts of Iron IV

Hearts of Iron IV

Expert AI 5.0
Recommended difficulty for the major nations?
What are good setting for the USA, Russia, Germany, Britain, and Japan?

I'm planning on doing a game as the USA first, I have played through this game only once last summer, and I think that I buffed the Axis a bit too much, got crushed in my invasion of Sicily, and then haven't played since do to the craziness of life!