I always render out to stills and then compress using Premiere.
However, I've never had the problem of the frames being overly jerky before.
Only things that really spring to mind are (1) are your frame rates set the same in LW and Premiere - If you've renedered one at 24 FPS and the other at 30 FPS then you'll probably get some strange artifacts -- especially if you've stretched the sequence on the Premiere timeline to fit the timespan you think it should fill.
The other thing I suppose is that if you have motion that is too fast for the camera to track, and no motion blur in place. This will also seem to jerk or strobe on your final output - render it with at least 50% moblur and that should ease slightly.
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