Imported Wordpress to CMS, no HTML
 

I'm having some trouble and I am not sure where to ask about this. Here are my problems:

1. My first import only brought over the first 100 posts. When I cleared it to import the full 600+ posts it did so, but the first 100 now all have duplicates. Is there any way to do a mass delete of CMS articles so I can just try to import them all at once again?
2. Piggybacking on the last one, at some point all of my CMS articles lost their author, because my Wordpress posts were brought in as imported_Webbstre, and after the merge into my admin account (because you can't connect accounts to an admin on import) all of the articles are now shown as having no author. When I try to edit the articles, there is no choice to change the author. What can I do?
3. Despite having HTML allowed as a posting option in my permissions, all of the former Wordpress posts just show the HTML as raw code. I can't find anything like the HTML options from the forum when editing (The Allow HTML, Convert Line Breaks, etc options), so nothing I do seems to make the HTML display as anything other than text code.

I'm assuming all of these problems are related to ImpEx, but if partial answers (like the HTML and the author changing) can be found elsewhere I would be glad to hear them.