I would be intrested in those peerless bosses
The swoop is good but as far as all the ML named monsters go they do not drop minor arties on thier corpse. They work exactly like the paragon monsters do and simial to how you have done it the difference being they drop the minor arty in your pack not the corpse. On production shards the Ml named do not drop paragon arties though only the ML minors. When they first released Ml paragon minors did drop on ML named creatures but they changed it.
Anyhow you may or may not have know about that but if not maybe it will help you. I would suggest however looking at the way paragons work and using that as kind of a template to do all ML named creatures by this way they will all drop minors the same way and only drop specific minors.