You really think buffs are so lethal? I dont see this at all. If you are having problems getting shot down buy uber buffs, the problem is probably technique, or just getting too greedy. Climbing up under a buff is not a good idea, unless its a lanc. diving in from 12 or 6 is also not advised.
Techniques differ quite a bit between bombers as well (like never attack a ju88 from anywhere behind it). Diving in from 12 is a good idea in this case.
Also, never try to blow it up, or knock a whole wing off. Just shoot the tail, or take out the wing tips. Then move to the next target. he will crash, sometime, and probably wont be able to hit anything if he makes it to target. Sitting on a bombers six and unloading 1000 rounds is not a good idea.