It has been clarified in different places and times that the units themselves, do not represent only one, or a group of that unit. For instances, one infantry doesn’t just represent a unit of infantry, but a whole battalion, division, ect… So in an infantry division, you are going to have anti air craft assets, anti tank assets, ect…
I would assume in the original axis it was the same. A fighter included all the types of planes one might find in a fighter group. Now tactical bombers were recently added to the game for versatility, but I still don’t think fighters are suppose to be just that, fighters.
There a lot of tweaks we can introduce into the game but it would make it more complicated. So I think the easiest changes should be first.
The simplest and most accurate change should be lowering the costs of ships and fighters. Though Jenifer pointed out the improve shipyards help, it is close but not close enough. The main problem is that you have to roll for it and the current rules for rolling has you roll for a breakthrough at $5 per dice, (which is way to expensive), then you have to see what you get, so unless you start with improved shipyards for everyone, it would be a start.
The price of ships across the board just needs to be redone and lowered as I outlined.
Tansports $4 (remember they are now defenseless), Subs $5, Destroyers $6 (They should not be the economical buy, but absolutely necessary to counter subs), Crusiers $8 (This should be the workhorse of the sea) Battle ships $14, Carriers $10, Fighters $8, Tac Bombers $10.
And reduce Air Bases and Naval Bases