Simple explanation:

Using the SimplePie parser instead of the Common Syndication Parser results in the following PHP error on saving:

warning: array_shift() [function.array-shift]: The argument should be an array in /home/cotton/public_html/rss001.com/includes/form.inc on line 1320.

It doesn't seem to adversely effect anything that I can notice so I've turned the screen warnings off... it me be a conflict that has nothing to do with Feed API

Also, although all items on a feed are parsed, only three show up in associated 'feed item' as here:

http://rss001.com/feed-item/660

How do I set it to display all items?

Good work on this by the way, thanks