I thought that it was said that if a plane is maneuvering (changing alt and speed) that it is more apt to be hit by Flak. Bombers are usually level and at a steady speed for calibration purposes. As far as a low alt approach to CV (on the deck), I don't think the auto flak shoots at anything lower than 2000ft. I have made low alt approaches to bases, towns and CV task groups and I can tell you that your bomber formation will take considerable damage from auto ack. Above 10k over the task group, you only deal with flak and not the auto-ack.
A VH hardness that is increased probably would make no difference with bombers either on the deck or high altitude (they carry a lot of ords). Increasing the hardness of the VH in relation to planes carrying ordinance, it would put out the possibility of a fighter with the ords available to be able to kill the VH. Right now the setting I believe is around the same as the hangers, 2700lbs to kill it. That gives say a p-51 fully loaded (2-1000lbs and 6-rockets) just enough to kill the VH.
I would prefer it stayed where it is. (shrugs) If it changes, you just see more heavily loaded planes killing the VH. If they want the VH dead, it will happen.
One-eye