what is your final format?
what format did you shoot?
go to audio/video settings and set your capture preset to hdv-prores hq, this will capture HDV and transcode it to prores
then cut and do all work on a prores timeline, clips you want to do speed changes to you can send to motion and use optical flow as your frame blending option.
this will take some time but give you fairly good results depending on your footage and what you are trying to do.
actually, once you captured prores you could try to slowmo in FCP and see if it looks ok to you.
once you are done with everything export as quicktime movie using current settings
then re-import and place in a prores SD timeline, this time forcing timeline settings
its one way to do it…
Hector Berrebi
Schibber Group
prePost Consulting