1. Become a better aimer. (This is very important when you come to step 2.)
2. Most optimal choice versus Bombers is to become a really good user of the 2.0 Codenames. Stack four of em' up and one full salvo will deal around 1/4 of Bombers hull, it is quite insane if you can hit with those well. If not, a 4.0 refire rate guns are good. The most important is that you pack a strong punch in the hull-damage.
3. Get lucky enough to not meet skilled Bomber pilots who know how to use their vessels against Fighters and have the chance of hitting you with Supernova and dodge very well at the same time against incoming guns.
And, you could always be annoying and go with a: Sidewinder, Firestalker, Lancer, Cannonball setup, 4-5 full hits should knock off every gun the bomber has.
Anyone who says Fighters stand no chance versus Bombers 1v1 can PM me if you like, and we can test that statement.:)