I might also recommend lighting your green screen separately, and - if possible - at more of a distance away from your back. Part of the problem with keying it when it's so close is color spill. You're getting a little of that green on you when the light bounces off of it and onto you. If you put more of a gap between it and you, then light it separately, you'll get a cleaner key.
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Thanks Winston! I got this exact advice from someone else also. I played with it a bit more today and got it looking a lot better by lighting the backdrop: https://www.facebook.com/750870567/posts/10156116519175568/