Swarms are docile by nature, I wouldn't take their temperament when in a swarm cluster as an indication that they aren't related to the feral colonies in the tree.
Feral colonies in trees is one of the biggest sources of swarms we collect. When turning up to pick up a swarm there is either an old gum tree within view.. or a backyard beekeeper who hasn't done swarm prevention (rarely anything in between!)
Did you collect these swarms? If not, call Joey here http://www.perthbeeswarm.com/ We refer all our WA swarm calls to him.