Well, trying to load the 1937 map breaks my worldbuilder _every time_, so i guess that is out.
I would humbly submit a few things that should be added to balance the additions you've made:
Since unit-specific factories are now so expensive, normal factories should also be expensive. a more significant breakdown would be:
Factory: 7 gold upkeep, Land_factory/shipyard: 8 gpt, aircraft factorires 4gpt each.
Also, i think the military academy should provide more EXP but also cost a lot more, like 25 gpt but give +50 EXP, and the military base should be cheaper GPT.
Unit spawn adjustments:
1. The africa korps spawn of units should have 2 stuka and a bf109 in Tripoli
2. The "happy time" german Uboat spawn should be dramatically bigger for AI (like 2 or 3 other pockets of 3-5 uboats) and this should occur every 10 or 15 turns until 1943.
3. The unit-spawns of Russia are a little too focused on the northern part of the country. Finland fell quickly in the last 2 games because of a surge of soviet armor, while germany(once as myself, once as i watched from UK) blitzed to Smolensk and Kiev without much opposition.
A broader concern i have is that Germany doesn't expand as aggressively as it could (it did in one game, but i added a lot of population and a few manufactures to make my UK game more difficult), and this is mainly due to inadequate units left and home. Some kind.
Also, all AI navy's are insufficiently klumped together, and as easily picked apart. They need to retreat them when they get below half health, every time. IDK how to modify the R.E.D. behavior, but its a bad lingering problem with the .dll or whatever for a while now that i've noticed.
e:
on a practical note, there isn't a USA 'supply/advance' route, so they don't actually do anything even when they enter the war. I struggled through several hours of blank-turning to get to late 1942 as Germany, waiting to see signs of movement from america but they wouldn't attack anywhere.
