From: the flight deck of the Zuikaku
My only game stopped on 12 Jun 42. Here were my stats compared to yours on 6 Sep 42, so you have 3 months on me....
Manpower - my 592,224 to your 874,192 - Wow! Do you repair captured manpower centers? I don't. I'm not sure if manpower ever becomes an issue and assume it doesn't but I'm not sure. At any rate, I think you're good here.
Heavy Industry - my 304,489 to your 238,900. This has been addressed above and I think you're on the right track reducing armament production. My HI was banking about 4k a day.
Armaments - my 101,609 to your 153,338. I had reached my goal of 100k about a month earlier and had reduced production. Unfortunately, I don't remember how much I reduced it by. I was going up by ~100 a turn on average.
Vehicles - my 7985 to your 950. I had problems initially and had to increase my vehicle factories to 150. That did the trick. If I recall, I was going to attempt to keep the pool at >10k and then reduce production. I think you need to increase vehicle production. You may need it if you take heavy losses and want to rebuild the units.
Naval Shipyard - my 270 to your 24,924. I didn't change the naval shipyard points from the starting 1404. This next game I'm considering increasing it to ~1100. The ships I accelerated, I did from the moment they could be accelerated (1 additional point per turn) to the moment they cost 2 additional points per turn, and then switched them back to normal. I accelerated CVs and DDs. I shut off only a few Ro class subs as well as the Shinano. You're addressing this huge surplus so you should be ok. That's definitely a place where you don't want a surplus. I try to keep 250-500 in the pool for those times when something new reaches the point where it starts using points.
Merchant Shipyard - my 54,561 to your 7,537. I don't accelerate any merchants. Tracker showed me that we'll need the points later in the war so I let them ride. Lots of people don't like to take ships late because they're just Allied VPs but I don't look at VPs in the game. I just play it. If I don't want a particular hull, I'll shut it off with one day remaining. I might just need it later. You never know.
Fuel - my 3,283,345 to your 3,129,370. My fuel usage was finally starting to level off. I think you're pretty much in the same boat.
Supply - my 4,105,576 to your 4,272,371. Pretty similar. My supply was rising so I was happy. I'm going to be more aggressive in my next game because my supply rarely, if ever decreased. I pay close attention to this so I don't over extend the economy.
Hope this helps a bit.
Created by the amazing Dixie