goodroi - 9:29 pm on May 16, 2013 (gmt 0)
Welcome to WebmasterWorld!
How old and established is your site?
If your site is very new or has very weak backlinks it is much easier for other sites to outrank (especially if you give them your content to republish).
You may want to delay your rss feed and submitting content to other sites until Googlebot sees the content on your domain first. Otherwise Google may accidentally think you are one that is republishing content.