I'm trying to pull off a strange type of chroma key where instead of having the subject over the background, I'm layering the backgrounds over the subject with a green screen behind them. It's an interesting effect and gives me what I'm looking for. Here's the problem. I'm getting jagges lines around my subject. I've tweaked and made every adjustment using the chroma key plug in with no luck, I have the chroma blur on max and used a quick blur with no luck. Everytime i render I get the jagged little lines.

thanks for your help