rhymeswith, apologies, only just caught up with your post.
My fw had the same boot file as yours and I used that instead of his - but it made no difference in the end because the sync was just as bad. Still haven't found anything to remedy it, though XBMC is not too bad on h.264 files and VLC on standard-def divx. Am holding my breath for improvements with eventual updates to both of those. Have so far tried GB and ICS fw - would like to try the Pivos firmware too, but it comes as a single update.img file instead of a zip, and not sure how to decompile it.