As it stands now, the only decent threat to a bomber at reasonable alt over a CV is manned ack.
I agree, along with a good fighter defense. I've sunk a lot of CV's in the game, mostly attributed to ease of access. The only two factors that prevent me from hitting and/or sinking it is a good 5" gunner, or fighter patrols. The CV's maneuvers are too predictable due to the unchanging speed in which it travels, therefore it is easy to position the bombsight ahead of the CV while it is in it's turn arc. At 8K altitude, anywhere it moves to evade getting bombed is too little, too late.