Hi Chad,
Here's a great thread from Q&A that offers a few different options for addressing your Hatom feed errors: Wordpress Hatom Problem. To be honest, though, I currently need to address the same issue on one of my own sites, and Authorship rich snippets are showing for all of this site's blog posts in the SERPs.
While I wouldn't ignore the Hatom feed errors altogether, I would change your Google+ profile image to a likeness of yourself right off the bat. Authorship is meant for people, and is why it requires reciprocal linking between an author's article/post and their personal Google+ profile. The Google+ profile you are currently linking to is showing a branded image (vs. your smiling face). I've seen Authorship suddenly start showing for people who updated their avatars from a side profile shot to a full-facing one, from an image with dark glasses to a one without, from one with a busy background to one with a background that makes their portrait pop, from a group shot to individual portrait, etc. And while I have occasionally seen logos show as Authorship snippets, this is the rule, not the exception.
The next thing I would do is enable bylines on your blog posts and articles where this makes sense. Then I'd work on regularly publishing useful, high-quality content for your audience on your website/blog -- and build up your personal Google+ profile. Those are good starting points!
Finally, you should also know that Google has never guaranteed showing rich snippets for Authorship in the SERPs, and recently reduced their presence in the SERPs by 15% about a week ago. You can read more about this in this blog post for Virante by Google Authorship expert Mark Traphagen. Work on becoming known as a quality author who posts on quality websites, though, and this shouldn't be a problem. (Easier said than done, I know. But you can do it!)
I hope this helps. Please let me know how things go, and if you need clarification. Cheers!
Christy