Reeling in the Japanese
Here I am short of ideas. I am hoping that the cargo reduction in DBB-C plus possibly some minor tweaking of the economy will be enough. The one idea I am toying with is a rethinking of VP for bases. There are some bases especially in the SoPac that have high VP value for Japan (Suva and Noumea come to mind) While in the game, these are nice grabs for Japan, they really are a long way away from their strategic goals. Conversely, I am always surprised at how few VP Japan gets from places like Palembang which may be the single most important base on the map. So, the concept is increase the value of the SRA along with possible increased garrison requirements while decreasing the value of the low hanging fruit in the SoPac. As this is meant to be a "historical" mod, Japan should be rewarded for "taking care of business" and detered from far reaching land grabs that really had nothing to do with the strategic plan. Now, the stickler in this to avoid creating a situation where autovictory becomes too easy to achieve for Japan in 1942/1943. Then again, if Japan takes what it truly needed and lays a stinging defeat or two on the Allies in the SoPac, shouldn't an Autovictory be possible. In my mind, Autovictory for Japan is not necessarily "winning" the war but getting to the point where FDR had to make the call to Churchill to say "Europe First" is just not doable considering the present circumstances.
So following this thought, boost VP of Oil/Refinery Center hexes, lower significantly VP for locales in the SoPac, lower significantly VP for anything on the wrong side of the "line of death" in India and Oz, and increase garrison requirements in the SRA. By pushing the base VP to a point closer to autovictory just by having Japan take what it did historically, it may make the Allied player a little more conservative about protecting anything that might push the Japan player over the threshhold
This will take a lot of work to figure out.
Actually, if you are aiming toward auto-victory, it is more important how much the base is worth for the enemy, not you. Remember, that depending of year, what points enemy loses, is worth for you up to 4 times as much, as you do not need to get that much points.
But YOUR points for base can be increased by upgrading such base. So if there is possibility of much upgrades, the more points base is worth, the better possible benefit, even when you do not need it to be so large.