Well after many tests i've discovered
1 - if you edit in FCP - then transcode the finished timeline to DNxHD - it works
2 - DVCPRO HD is hit or miss - sometimes yes - sometimes not - all in the same timeline
This is all with AMA Relinking in Avid 5.5.3
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I've yet to get Boris Transfer to work
Forget motion effects or titles - they don't carry over
Color correction filters -- not happening
I'm told if you use Boris BCC - those effects DO carry over.
Overall it's a bit of a time consuming pain (especially if you don't know AVID very well)
I plan on spending my time learning it as FCP no longer offers a solution for what we need -- although I'll ride FCP 7 as long as the system software doesn't blow it up.