Like Lazer said its all a balancing act.
The point of the game is to make defending possible as well as attacking possible but evenly. There shouldnt be one side that has an advantage over the other.
So lets say HTC drops the amount of ammo it takes to drop a hanger. Now you can drop a hanger with your FW. I can then drop 3 hangers with a lone P47. If I bring a buddy we can flatten a field and keep it suppressed for a good amount of time giving the "attacking" side an advantage over the defending side..... poor game play. Players stop defending and the game becomes a race to capture the requisite number of bases to win the war and you have lost all air to air fighting was the game is based on.
The game can be played many ways. My squad does field attacks with nothing but Jabos often. We also will come in low and hard in lancs to flatten everything in a single pass. Maybe you should find a squad to work with.
Today, I suspect due to smaller numbers online, the map was smaller but the same planes were still flying to get the job of base capture done. Instead of smaller maps leave them as they are and instead expand plane options by reducing Jabo requirements. In the long run Operation Bodenplatte is considered a failure but the devastation wrought by luftwaffe ground attack cannot be denied. An F-8 or even a 109 with a 250-500 kg bomb, should lay waste to any tinfoil hanger and its contents. Does a P47 have an advantage? Hell yes it does but a Shrike ought to be able to do much more than just scratch paint. Heavy big uglies would still be required to carpet bomb towns and factories to capture a base.
