I didn't try your program but it seems you didn't make any modifications to the QTE library itself? Using simply direct FB is a very ineffective way of utilizing the e-ink display. So far as I can see from the reverse-engineered Java code, there're at least 3 ways of updating the display: total refresh (the black-white-out), redraw without refresh, and areal refresh.
There is actually a program shipped with Kindle (cannot remember the name) which demonstrates what I talked about in the above. I believe the Qindle developer did a better job in integrating the framework with Kindle DX hardware. And I just saw they've uploaded a modified okular for PDF reading.
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