Looks like a fun series.
There is one problem I have with the PTO matchup, when it comes to scoring.
The ord capacity of the US planeset is so much better than the Japanese, I think some score balancing might even things out a bit.
B25C Can carry 3k of ord.
G4M Can only carry 2k of ord.
It will take 50% more G4Ms than B25s to have equal lethality. For this, I would suggest G4Ms be scored as 10 points, while B25Cs are scored as 15 points.
With the 1k bomb restriction to B25s, that levels the SBD vs. D3A ( though the SBD is a far more lethal fighter than the D3A ) so having them scored the same is ok.
TBM can carry 2K of ord, while the B5N can only carry 1.5k ord. And the defensive lethality of the TBM insanely surpasses the B5N. I would suggest a point value of 2 for the B5N, with a 6 or 7 for the TBM.
I don't know if this can really balance the things out, but it's been nagging at me for years.