The "ineffeciency" for Soviet union is somewhat intended. That helps soviet union not being too strong in 1941 and not being too weak after 1945.
I completely disagree with that notion. Surely the AI needs improving, not deliberate weakening. I would rather operate on the notion of maximising the AI's abilities (without the need for further 'cheats' such as free research etc). If the USSR AI kepts trumping the German AI, then I would rather change the structure of the game - either editing the IC, manpower, resources or whatever is needed. But, AFAIK, the AI massively fluctuates from game-to-game anyway, ergo any idea that one AI is better then another is hard to identify in the first place and so edits deliberately weakening an AI are un-necessary.
If things work out as intended most Infra will be 200% a few months before there war. The production lines allowed by that should have builded 1-2 units when the war starts. This maxes out the daily production output when barbarossa starts. The later is an approximation of what happened IRL.
But AoD isn't RL. A German player would've probably maximised the size of their army by June 1941, meaning they can easily defeat the USSR in the same year if has just built 1-2 units. I would rather face a clever AI, then a historical AI that is effectively blind to the changing situation (i.e. what if Barbarossa happens in 1940? What if Germany invades the UK? What if Japan invades the USSR? etc)
Maybe France could have switch to make more infantry if N.Spain is a Axis member? If the German-human player invades Luxenburg before Danzig or war it could also be switch for more land units.
IMO France shouldn't need to switch to making more infantry, it should just do so. What other units does a France AI need anyway? The AI is best at land combat (I know it's still awful, but it's much better compared to it's air and naval), and France only really requires infantry anyway. Once it runs out of manpower, it should focus on upgrades (by rushing 1941 infantry and 1940 artillery) and building land forts on its border with Belgium.
EDIT: Just noticed Pang's comment below Pioniere's, I completely agree!