Color to FCP contrast shift (DPX files only...)

I have a Color sequence which has a mix of raw .R3D files from the RED, and DPX files from VFX work... When I grade, and then send the sequence to FCP, the files which started out as .r3d files, have correct color contrast; however, the clips that are DPX files, seem to have their black levels raised... I am rendering to proRes 4444 quicktime files for everything, and this color-shift is consistent for every clip that originated as DPX files.
In Color the waveforms and scopes of the DPX sequences, all read correctly (blacks are at 0, and whites at 100), but when brought into FCP, the contrast seems off, and this is confirmed by the scopes in FCP (black levels are consistently raised to around 10 or so...).
Trying to sort it out, and will post any solutions I can come up with, but any thoughts in the mean time would be greatly appreciated. Thanks!
-Brian

Thanks for your response JP, however I am not quite sure that it is quite what I need (unless I am misunderstanding you...). I can't adjust the scaling on export, because I am not rendering to DPX, but rather to ProRes 444 (I could adjust each clip on import, but that would render the LUT and current corrections pretty much useless....). Let me try to explain a bit further...
We are importing the DPX sequences (95-685 Log) as Linear (0-1023), and then using an LUT to correct for the LOG space during CC. For the time being we are rendering with the LUT in place because we are outputting to video (the film-out will come later....). The workflow for the RED footage is pretty much the same (gamma settings in the RED tab are set to PDLog685, and the same LUT is used for CC)... Upon render (to ProRes 444), the RED footage renders correctly, with blacks at 0, however the DPX footage acquires some sort of contrast shift which puts the blacks at around 5-10 IRE...
For the time being we can apply a quick 3wayCC back in FCP and adjust the black levels for the affected clips back to where they should be, but it would be really nice to know/understand exactly where the problem is occurring...
Sorry if I misunderstood your response, and feel free to correct me if I did. Thanks!
-Brian

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Did I lose information when I zipped up the DPX files?
Nothing at all.
...my concern is that when I go to bump up exposure on a couple of shots that were lost, Im going to be dealing with artifacting, and working with a lot less information than the original DPX files contained.
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Hi again
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