I've never had a problem killing a VH by dive bombing, except maybe the new super ack ripping a wing off or out right killing me instantly (but that's another rant). A and P bases are 2500lbs or 3000lbs to kill the hanger, and V bases are 1000lbs.
With practice you can take a Vbase down in one pass, strafe the acks with your primary bank and drop a 1k egg in between.
For A and Pbases I dive in (-1C) drop the 2 1k eggs, pull up and 'dance through the raindrop' to reverse, kick off the rockets, switch the secondary weapon back to the secondary cannon bank and lay down on the trigger. Dead hanger.