danijelzi - I understand that the scrappers are not using your RSS to take the whole of your content. But almost certainly they are using some form of monitoring (probably your RSS) to see when you update and then scrape.
I don't know how much this matters to you - but you should delay longer than 45 minutes.
For canonical references refer to [googlewebmastercentral.blogspot.com...] - it is you telling Google that you are the original. If the scrappers do not claim this - then you should be classified as the true (cannon) content.