We live in the Mid-Coast area of Texas, very close to the entry place of the AFB, and have a lot of AFB genetics in our area.
We haven't found a way to calm them down. We wear full suits when dealing with our aggressive hives, make sure all the zippers are pulled up tight and cover spaces where the zippers meet with duct tape. I wear a short-brimmed hat under the hooded veil (fencing-type hood) to keep the wind from blowing the netting against my face. I quit using goat skin gloves because the leather isn't thick enough. Even with cowhide the bees will sometimes catch my on the first joint of the thumb when I'm lifting something.
I've heard thick nitrile gloves work well to prevent bee stings, but I've been unwilling to experiment with those, incase our defensive bees didn't get the memo.
As Baker's suggested, requeening is usually the best way to deal with them, but even then you can end up with an aggressive hive. We've requeened all of our hives, but still have one that is really aggressive. I suspect the queen has either been supplanted by a feral queen, or may have mated with local stock before we got her. I've heard that sometimes a feral swarm will come into a hive and take over.