When you're a publisher / creator using Affiliate Content Magic, you're using it with the goal of giving your affiliates tools to drive traffic from their site to yours, using your best weapon: your great content.
One simple, but easy to overlook element is that you want to make sure your RSS feed is publishing excerpts -- not full posts.
It makes sense: if the reader can read the entire post on your affiliate partner's site, why do they need to click through?
So set your RSS feed to publish excerpts only. If you're using WordPress, here's a video walkthrough of how to do it. (2 min)