Help keying jagged edges

Hello,
I'm keying some footage shot on a 5D. Everything seems to be going ok despite the footage not being shot and lit perfectly (time, budget, the usual).
I'm having a bit of a problem with near-horizonal straight edges, I think this may be due to the quality of the footage and the fact it was shot on a dslr with its slightly flawed rolling shutter/horizontal subsampling etc.
I've included a still for reference.
Can anyone suggest a quickish solution to straightening this out? Or will I need to keyframe extra masks for these edges? Also, can anyone confirm this problem is partly to do with the camera and not just my photography skills?
Many thanks.

can anyone confirm this problem is partly to do with the camera and not just my photography skills?
I can confirm that the camera and your lighting skills both contributed to your dilemma. 
Because you didn't take the time to set up the shot properly when you got it, you now pay for it in post.
Because a Canon 5D Mk II  records H.264 files, you have lousy color sampling (aka color resolution); I believe it's 4-2-0, which is every bit as bad as the 4-1-1 color sampling of NTSC DV.
Getting a good chroma key is all about the edges of the subject.  But bad color sampling scrimps on the color information available at the edges.
And what do you need for a good COLOR key?  Accurate color, perhaps? 
To see what I mean, take 15 minutes out of your day.  Watch the following video:
http://www.youtube.com/watch?v=44-FTEF1EAw
Bear in mind that your camera's color sampling is the same as the example you'll see for DV near the end of the podcast.
A DSLR might make nice pictures, but it isn't cut out for effects work.  If that camera has a full-time HDMI or HDSDI out on it -- that is, the resolution doesn't change when you hit the record button -- you can drop $5,000 to get a box that will let you capture video with 4-4-4 color sampling.
Your best bet: rotoscoping the offending parts.  That's how you're going to pay for your shooting haste in post.

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