DVCPRO HD - 24p from HDX900 not smooth

I am preparing to do an HD project on my FCP system. This weekend I ran some tests by downconverting a DVCPRO HD test tape w/ 24p and 30p footage with pans and other stuff to Beta-SP AND separately capturing thru FW400. The DC went thru an AJA SDI to component converter. Sweet little box. The Beta downconvert and resulting edits worked with no problem. The FW capture and edit (from a 1200a deck) led to mixed results.
If the edit timebase was 23.98, everything looked okay, but since my final output is SD via compressor, the SD file compressed from that timeline (to uncompressed 8-bit) showed problems in intrepreting the pans - the single problem I'm getting is an extra, duplicate frame of video every five frames.
This can be counted by pressing the forward motion cursor several times. Every 4th and 5th frame are the same. When you play it's a juddery effect. The Beta doesn't show this. The original 23.98 timebase timeline doesn't show this. Other manifestations of timelines (29.97) do. I believe this is 'normal' 24p footage. I captured with an easy setup of 720p24 and 720p30 to see if one got rid of the problem, but it didn't.
My ultimate goal is to downconvert to Beta first, so it won't affect me. But what if I wanted to go direct, as many recommend I do? I'd be in a bad way. So, what might I be missing? Much appreciated.
Chris

Just to clarify, (forget about the Bea downconvert part of my story) the way I'm going in this case is cutting the HD on a 23.98 timeline. So far, thankfully, that works. What's not working is the down-format. Ultimately, that will be in the form of a Betacam SP or DVCAM dub and certainly an SD DVD.
When I create the uncompressed 8-bit file in compressor, and reset the EZ setup in FCP to the BMD Decklink extreme codec, the remported file shows the camera pans displaying the extra fifth frame. I'm just trying to find a way to smooth out this part of the process. The experts on the group say creating SD through compressor at the end of the line is the thing to do. So I'm not so certain any of this points to my going the wrong way. But I'll be the first to admit I'm at my infancy in experience with HD and 24p. It get's a bit confusing.

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