The problem is that you are focused on the K/D ratio and are ignoring the gameplay aspect. If you make bombers into singles and essentially free kills then why should you ever take a slow flying, slow climbing B-17G with 6,000lbs of bombs when you can take a P-38L or P-47N that have ~3,500-4,250lbs of destruction (not counting guns) and can do two, three or four sorties in the time the B-17G does one and are more likely to make it to the target? Fewer level bombers means more suicide jabos.
The P-47D-40, probably the most popular bomb truck, had a k/d of .80 in tour 167. This of course includes instances when it was *not* flown as a bomb truck, these cannot be filtered out. And no one had two extra P-47Ds flying along with them after their first one got shot down. These numbers strongly imply that level bombers are at least as likely to place ord on target as the P-47D40, but alot more of it.
In cases where the the single jabo is shot down, the mission is over. In cases where the jabo is forced to dump ords to defend itself, the mission is also over. This is a common MA experience-jabos encountered a reasonable distance from the base are burdened enough that they are easy to run down, and easy to kill. They must either skin ords or die, and likely still die. Whereas buffs can and often do *kill a fighter or two* and still deliver between 6000 and 18,000 pounds of ord to the target.
If some sort of attack aircraft allowed a single player to actually fight its way to target, rack up what amounts to a 1-1 k/d doing so, and still deliver at least 6K and as much as 18k ords, there would be cries to have it perked. But that is exactly what buffs boxes amount to in AHII.
However, it is not an either-or proposition. Correctly me if I'm wrong, but I believe you have proposed that 1000 pound bombs on fighters be lightly perked, and I would also support that.
Do you want to see bombers in the game or do you want that diversity eliminated?
I actually don't favor eliminating formations, but taking certain other steps. But let's run with your logic here anyway...
Certain fighters like the 109E are difficult and relatively unrewarding to fly in the LW MA. You almost never see them. Therefore I think we should allow anyone who ups an Emil to have two drone "wingmen" and F3 mode...it would make things more "diverse".
Seriously, it is unlikely that bombers would ever be completely eliminated. But what we have is not really diversity. The buff formation is what moves maps in the MA, it is about the only mission profile that really matters. Interception is an exercise in masochism and escort is irrelevant. It would in fact be grand if there were fewer buffs being flown in the MA and more fighters being flown to escort them so that said buffs would stand a decent chance of reaching a defended target.
Instead we have a situation where 6 players in single fighters attempting to defend a base from 6 players in heavy buffs must shoot down 18 almost ludicrously tough aircraft defended by, if I calculate correctly, 216 .50 caliber machine guns, and carrying 108,000 pounds of ordinance. If even one or two of those 18 bombers get through, it carries enough to level a base and essentially win the fight. And it is demonstrable that average MA buffer vs. average MA fighter pilot, more than one or two WILL get through. Offense/defense are ridiculously mismatched in this case, to the detriment of game play IMO.
(Average MA buffer vs. "leet" buff hunter, the "leet" buff hunter will use his "patience" to set up and eliminate the buffs long after doing so does his side any good, then poo-poo any suggestions that heavies are a bit unbalancing in the MA by crowing about his k/d vs. buffs

)
However, I don't think boxes will ever be eliminated, for aesthetic reasons if nothing else. My most conservative suggestion is lowering the ENY of the big heavies to 5. The last thing the outnumbered side needs is waves of bombers taking their hangars away. That is the most boredom inducing non-fight imaginable.
My other suggestion is to limit single players to controlling single defensive positions on buffs. Three tail guns firing at an incoming attacker is still a lot of discouragement, but not ridiculously so. It is also my perception that the individual gunner positions are very hard to kill, even when pouring fire directly into them, and this should be looked at. Maybe 30 millimeter cannon fire walking down the fuselage of a buff shouldn't bring it down, but it should probably kill/disable every theoretical "human" inside.
Also, were it possible to coad, I would throw bomber pilots a bone by allowing them to fill all gunner positions with additional players beyond the one gunner currently allowed. Hey, if your bomber formation is a death star because you got 6 really skillful gunners to join you, more power to you. This is teamwork, this is what MMO games are about, but this is NOT an overwhelming flotilla of destruction that is unfair to the poor devils trying to defend.
Also consider new player retention. New players frequently start out in bombers as they can participate and have some successes and useful contribution in them whereas if they are forced into fighters they are just killed over and over and over with little or no reward.
This is highly speculative at best. You could just as easily speculate that we lose noobs who are looking to shoot down bombers for easy kills but who (correctly) call horsehockey when they get buzz-sawed to death by another can't-fly noob in buffs because of the overwhelming firepower given to single players by buff formations vs. driving any other plane or vehicle.