I'm trying to get a matchmoving forum up here, at the moment without much luck.
What exactly do you mean by 'can't get the camera motion right?' Does it look right in PFTrack but wrong in AE? Once you have tracked the camera successfully and imported to AE, then the Particular part should take care of itself.
Make sure you export locaters from PFTrack so you know the position of various objects in your scene so you can line up the emitter accurately.