What is the version number of FAAST that you are using?
I'm wondering if all the other tracked objects are off by the same amount. If so, you could do an initial calibration where the user's highest tracked object (head) and the lowest tracked object (foot) are visible to FAAST, and then figure out the difference. That should provide a loose approximation of the user's height. I'm not sure whether or not this would be accurate enough for your application.
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