Which version of AE are you using? I would probably skip AE's regular tracker and use mocha for that. You might have to tweak the last few frames, but it's a planar track and mocha's great at doing those.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.