AVCHD import of moving clips very jumpy, not when done via FCE or Voltaic

Hi all,
I have a problem when importing clips from my AVCHD cam (a Sony HDR-SR7E) into iMovie 08. When the clips I am importing are of moving objects, or sweeping over a scenery, the imported clip are sometimes extremely jumpy. Like if ist was taken with a frame rate of 1 or 2 fps. It doesn't matter if I choose Large or Full quality, the result is always the same using the specific clips, and impossible to use in an edited movie. And it is not a playback problem, my CPU meters are only up to about 1/4.
If, however, I import the clips into .mov format using another program, like Final Cut Express 4 or Voltaic, then importing it into iMovie 08 using File -> Import Movies the quality is excellent! Nice result/fps with both Large and Full quality/conversion settings. Strange isn't it.. ? So it seems like the import process (and not the converting into 540 resolution if that is done) is doing something wrong in iMovie 08?
I do have some third party codecs installed, like xvid and possibly divx, but not Perian (that I have read has been causing some problems before).
Has anyone else noticed this problem? What is Voltaic and FCE doing in the import process that iMovie 08 is unable to?
Thanks,
Henrik

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