I got same problem. What I did was and it might be somehow meta - I didnt go for central planning but kept the slider in the middle, rather go hawk lobby quick to decrease build times and sooner experimental lines. I also did attack and conquer France in 1939, spending 1940 invading Norway (which took forever cause tanks are crap there) and some Balkan fun, including Greece and plan to send few divisions to Africa. Now I have some 180+ divisions preparing against Russia and I will again launch invasion on 22 june 1941, with like everything I have. I also didnt bother building up much airforce, spending some IC to build AA, especially prior to having research infantry 1936, where theres alot of space to do that. Now im upgrading, got some 20-25 mobile divisions incl. SS infantry, armor and mot, about 20-24 INT and 20 CAS. The huge russian mob. Well, its about one battle at all.