Well in reality fighter bombers are always slow and as such get chewed up by enemy fire no matter what weapon… After uncountable hours trying to get a working fighter and bomber controll scheme i figured out the following.
Set your bombers to prioritze fighters first… and set their engagement range to 2000. This means that as soon as your bombers hit the feild they are gonna avoid anywhere fighters are… this extends their survivability drasticly. Using 2 torpedo launchers has always worked out best for me… with an engagement range of 600 or so. This allows your bombers to kill their targets quick and only a second of time in which they a in range of defence lasers.
setting your bombers to stay away from anywhere fighters are is the main point. Let them come in to play once all the stuff that would prioritize them over your other ships is dead.