On some pages of iTunes, it displays the artist title. So go into PowerPress Settings > iTunes and change the artist field to something else, or leave it as is.
The other pages use the RSS description or itunes:subtitle. You can edit the description by going to your WordPress settings > Reading and edit the tagline field. iTunes subtitle is on the same page as your other iTunes fields including artist.
I confirmed by looking up your ID 372257397 on iTunes, that iTunes is pulling
http://chriskresser.com/feed/podcast. So this is good as far as your listing on iTunes.
Important though is that any past subscriptions in iTunes desktop applications will still be pointing to the old feed. Very important though, you need to find out what that old feed was and redirect it to your podcast feed (or set the itunes:new-feed-url setting in the old feed to point to the new one).
This is my guess, and I may be wrong, but I bet you originally submitted the main site feed (
http://chriskresser.com/feed) to iTunes, which looking at it now would explain why only 1 episode appeared in your feed. iTunes only displays posts with media, so the other media items would have disappeared. Just as a precaution, I would go into your old blog and in PowerPress settings set the iTunes new feed URL to
http://chriskresser.com/feed/podcast. If you have any friends subscribed to your podcast, you may want to check with them if they only see 1 episode, or if their subscription updated and has the last 10 episodes correctly.