You’ll probably get a better response from the WordPress.org forums, since they deal with importing from WordPress.com and we don’t. Similar advice for your API query, although later there might be someone around here who can help.
I am having the same nightmare. No one is answering my query in wordpress.org.
I also tried to erase all CDATA craziness and imported the xml file again.
Comment author still not showing! http://sandierpastures.com