Configurer comments not working.

This is a two-part issue.
The first is that I cannot get any comments on my YAML config at all using any common trick.

When I finally use YAML nodes, the whole node structure is displayed with all the right contents(over 100 lines of it) for only a 4 line piece of information. Could it be an unmarshaling issue?
I also notice that the API manages to display nicely commented YAML file? Can I do the same thing if possible?