Ran a handsoff test, and I'm quite impressed. US landed in Italy already in -42, USSR and China are much more aggressive.
Though a couple few things that have actually gotten worse or still need improvement.
For some reason Finland, China and UK divs sink to really low strenght, around 5-10. Maybe the attrition, IC, manpower or reinforce priorities. I read that desert attri has been decreased, but it still seems the same. Winter attri is way too high now. I've seen Soviet divs suffer 15% attrition. Finnish divs can barely stay alive in their homeland, even during peacetime.
UK and Italian home multipliers are way too low. UK was defended about 5 divs, Italy 2 divs. One US motorized div basically lands unopposed, and then advances without much opposition all the way from Sicily to Austria... until German reinforcements arrive.
Tripoli (Libya) again an easy target for a UK landing. Basically the Brits landed there about 5 times and the Italians always had to divert forces to drive them off. I'm gonna try tweaking some priorities, or add locked garrisons if they gotta do the job.
China is a lot better now, though Guanxi didn't dow China. Nevertheless China held off the Japanese pretty well; Nanking fell in -38, and in -40 the situation is pretty much a stalemate in the interior. Still in -42 a stalemate with the Japanese advancing a prov or two. China runs out of rares around 41-42. There was the Burma road event for resources, but I got to check if it's actually working. That could be a good way to prevent Chinese resource shortages, while pressuring Japan to change focus to a war on the Pacific.
1941 Barba is quite impressive. Though Finland quickly collapses for the reasons mentioned, and Germany gets stopped around the Dnieper line. Soviet counterattacks are quite impressive, but Germany still makes quite significant progress in 1942... mostly in the North. I would weaken the Soviets a bit for -41, and strenghten them for -42 onwards.
Germany runs out of rares in -42, just like in 1.04. The AI is on hard, yet even the resource boost isn't enough...
Germany doesn't garrison Norway properly, UK makes an easy landing in -41. But could be due to Finland getting owned.
Also I've only seen USA build infra. Basically every +7 IC / resource rich prov should be built up to 200%. Except cases like Paris and Warsaw.
Gonna try fixing some of these issues, and running a new test. But really good work so far guys, you impressed yet another HoI veteran over here!
EDIT: Could someone please tell me, where in the AI files do you have the new infra lines.