450K HI stockpile in May 42 is fine, actually quite good. So, I don't think you have any issues there.
If you are short of supply, there are three culprits:
1. you are adding a lot of replacements to your LCU's. Replacement eat supply at the load cost of the device being replaced. IJ starts with a lot of units under their respective TOE. If you have the replacements turned on, you can eat a lot of supply.
2. Over zealous factory expansion. 1100 supply for each factory expanded. Most newbies to IJ expand their a/c factories too much too fast .... think of it this way, 30 a/c factories expanded to size 30 is 990,000 supply chewed up. If you eand engines factories to match ... double it, so now 2,000,000 supply. And of course you have 78? starting a/c factory locations. I've seen some expand all of them ... +4,000,000 supply ...
3. Finally, and oft-overlooked: COMBAT. If your game is high tempo with lots of combat your LCU's burn through supply at an incredible rate; 10 - 20 x the resting rate easily. So if your LCU is normally only eating 5 supply/day, in combat it could be eating up 50 supply/day. Multiply that by 200 LCU's and ....
As a player, you control all 3, but the last one less so. If your tempo is high, then you have to curtail your expenditures in the other two. Ex: If you have +300 LCU's committed to a major land campaign in say China, you may not be able to expand your a/c R&D as quickly as someone who stops at the historical boundaries and begins to consolidate. IJ economy is in fact quite limited. Your strategy must be bounded by the economy or you will collapse it and give an easy victory to the allies.
In fact, one of the easiest and most effective stategies any allied player can do to a newbie IJ player is simply keep the operational tempo high in '42. Most IJ players will implode their economy giving the allies an easy victory in '43 as the IJ has no fuel or supply in '43 to defend with. They will have some fancy new planes though ...
To throw a few more bones out here: Read MikeS AAR's. I think there are 3 of them ...
1. You will see MikeS and I frequently talking about supply floors: we won't let supply drop below a certain level in the HI ... we turn off factory expansions to maintain that level. We will have these in all theatres.
2. You will see that we are also really careful about turning replacements on ... very choosy about which units are receiving and when and why. Most units are not and never do the entire game. BTW, this was historically the fact as well. IJ didn't have the economy to fill out all of their TOE's.
3. Both of us are very careful about offensives. They are very expensive and we choose these carefully, have budgets for them and review those budgets carefully as the offensives unfold. I've stopped offensives many times if they are going too far over budget and goals are not being met. Again, consistent with history. IJ scotched quite a few plans as they could not build up the support for the offensive.
4. We expand factories very slowly and carefully. Ok, Mike does it at a snail's pace ... I'm more like an ant's pace. Still, we are only having a few factories repair in any one day, not 10 let alone 20 or 30 as many players do.
Oh, and this is what we do for Scen 1 & 2 ...
Thx Pax! Very interesting! It's clear that managing japanese economy is much more compicated than what it seems at first sight. And probably the most difficult thing is to be able too foresee which will be the consequences of your actions in 1, 2or even 3 years from now!
I'll give another read to those mike Solli's threads u mentioned....