If they are mean and not Africanized do you want to keep them? If they are nice and they are Africanized do you care? If they are mean, requeen.
The smaller Africanized bees are just because they are feral on natural comb. DNA is the only real test, but since the USDA was raising and distributing Africanized honey bees up into the 60s, my guess is they are all Africanized. Still, the issue is that you want workable calm bees. So requeen if they are not. If you want to calm them down quickly, split and requeen. A smaller hive is much less defensive.