Bombers need to be optimized such that they are more alike anti-cap effective.
Things that could be done are,
Decrease bomber's agility, speed, strafing, response (To make it near impossible to beat fighters).
Decrease the speed of SN (To make it near impossible to SN fighters).
Increase bomber's armor and firepower (Same reason with below).
Increase the damage done by SN (To make the bomber more cap effective).
Increase the range of SN (To make caps need fighter wings to take care of bombers).
Bombers should be basicly heavy meats with heavy firepower. But they should be prone to any kind of attack and bound to fighter support and cover. They will become tactical ships to use this way.
On the uncharted lagoons of anguish, I sail with a canoe made of my sins.