Would this be late 1943?
Service Dates
F6F-5 ... 7-44
FM-2 ... 9-43
Ki-61-I-KAIc ... 1-44
A6M5b ... 3-44!*
*A6M5b ... 3-44!; The only difference between an A6M5a, which entered service in 1-44, and an A6M5b is the switching of one of the 7.7mm machine guns in the cowling for a 12.7mm machine gun. Substituting the A6M5b for A6M5b is reasonable. The A6M5 entered service in 8-43, but was significantly less pretected than the A6M5b. Nonetheless, this switch is probably still reasonable.
Kinda looks like a '44 battle to me. Thus mabey adding the Ki67 and limited nikis and limited F4U-1Ds
Or
Replace the boston with the SBD/TBM. Take the A6M5, Ki61,F6F out and replace them with earlier A/C. But thats just me.