However, have you also had issues with your feed’s URL being indexed in Google at all? I am not sure why I didn’t catch this before but if you login to your FeedBurner account >> go to publicize >> then go the very last link on the bottom left titled: “No Index.” By default, “Indicate that your feed should not be indexed by search engines” is checked and therefore your Feed will not be indexed in any Search Engine.
One thing you should consider before changing this default option is whether your content is updated frequently enough so that you don’t trip any duplicate content filters (between your blog and your FeedBurner feed). You should also consider the number of items you display on your blog’s home page vs. your feed – this may also get you into some duplicate content issues if they are too alike. However if you post unique content and you post often, you shouldn’t have too much trouble.