I agree with Muckmaw, bombers are fine the way they are now.
I think we're at a point where it's close enough whether you give it tiny tweaks one way or the other or not...
Bombers are survivable and can down 3-5 planes if the interceptors don't know what they're doing..
Bombers are also vunerable and can be blown away in a single pass by an interceptor who does.
Good gunners who know what THEY'RE doing also matter.
I still do high alt buff runs (18-25k) and also intercept high alt buff runs and my experiences say it's balanced from both sides.
Of course I consider myself a good gunner (someday I'll manage a 2:1 k/d in 17 formations) and my best flights are where an excellent FW interceptor will play tag with me above 18k, tension and immersion really come into play when I see him setting up a deadly pass and the outcome is never certain. Good interceptors vs good gunners make the buffing game excellent these days.