Bombers seem slightly over powered ... if you have enough of them say 20+ squadrons you can take out anything in 1 attack run... and well they need a better counter ...
regular fighters seem to ignore bombers ... and well some thing should be added to base defense options that can counter a swarm of bombers.
just my 2 cents
(I know massing any type of unit can be deadly but since fighter craft seem to never take damage and are extremely fast they become unstoppable when massed)
Regards
-Dance Commander