Too much downsizing

Hello,
I’m trying to replace car plate on a moving car. MochaAE tracks very well. But when I’m copy/pasting keyframes data (corner pin with motion blur) to After Effects timeline, car plate becomes enormously downsized with CornerPin effect. To compensate this Scale keyframes goes around 200-300%. The result - pixelized (low res car plate image). How can I avoid this ?
P.S. Video is FullHD, car plate image dimensions 1600x390 pixels.
Thanks in advance

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Hi there, can you let me know if you went through all of the steps outlined here? mocha Pro demo live from IBC 2011 in Amsterdam - YouTube

I just want to make sure I’m not confused. Please send a screenshot if you are following those directions exactly, pasting on the first frame, and making sure your clip settings match between After Effects and mocha and the comp is still not working.