It is possible to successfully export an XML out of FCP 7, import that into Resolve 8.1.1, have it match up to all clips. Then grade clips in Resolve, render them out as individual shots with handles, export an XML out of Resolve and import that into FCP 7. This returned XML correctly links to the graded shots.
All this works and I have just finished 4 episodes of a 8 part series with this workflow. Apart from the occasional mismatch – which could be traced to sloppy labeling or no timecode – I haven’t seen the range of issues you describe.
You problems seem to stem from the fact that your original source files do not have a reel and timecode. And/or that you have mixed frame rates. You also need to ensure that you do not choose to automatically add clips to media pool when importing XML into Resolve. But, ensure that all your clips are in one place when still in the FCP 7 timeline, then import clips into Resolve’s media pool and then import the XML. It will link to any clip from the media pool.
Also, render all the shots in one go and then immediately make an XML.
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Neil Sadwelkar
neilsadwelkar.blogspot.com
twitter: fcpguru
FCP Editor, Edit systems consultant
Mumbai India