The problem with being 'successful' - is that you're not addressing the real problem - aggressive genetics. The bird's offspring are going to be just as nasty, and the training only works when you're there.
I'd rather have a rooster that doesn't attack people than one I've trained to not attack me.
I can take many but not all birds that are considered not to be human aggressive (possibly even some of yours) and put them in the hands of parties that have had human-aggressive birds. Many of the previously non-aggressive birds when in the hands of the latter parties will then become human-aggressive. The issue is not only genetics, rather some of the problem stems from how the keeper behaves. Much of the problem comes from the human side and ignorance / bone-headeness is preventing issue from being properly addressed.
When it comes to genetics of behavior I have a pretty good handle on that so you are not telling me something I do not know. Genetics does play a role but most birds you have issues with I would not nor would other parties that spend time around my yard.