I think NF types, Beta perhaps more so than Delta, would have the most trouble typing themselves. I don't believe Delta STs would have a harder time...
I suspect supervision to work better with similarity along the inert/contact subtype dichotomy. Base subtypes like base subtypes, same with creative...
Enneagram isn't inborn so is attachment style. Yet, attachment style is an important factor of compatibility, because how we adapt to people and form...