Re: Scratch 6 and Premiere pro CS5 RED workflow

Changing Metadata means, you did alter some vaules within the Process-Menu.
This is not being seen as a "grading", since all settings under the Process-Menu determine the way how Scratch interprets the footage (because every grading starts upon the already correct interpreted files)
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In my opinion, Scratch doesn't include any changes made in the RED-Metadata-options into an exported lut, since these settings are not taken into account as an actual "grading".
So in a lut would be included everything you set up within the Matrix, but not how you interpreted the footage within Scratch - probably that's why there's a difference, when viewing it in Premiere.

Concluding, you would need to tell Premiere to exactly interpret the RED-Footage, as you told Scratch to do (color-temperature, ISO, F-Lut, etc...) and then apply the lut you exported from Scratch.
Apparently, I don't know how Premiere /Lut-buddy interprets your 3D-lut at all, so this might also be checked (perhaps through using a more simpler lut and see what it does).
What could also work, it setting up each value of the Metadata in RedCine-X and save it with the clip itself. If Premiere uses the same original RED-Files, Scratch uses, this could also work.

Maybe there is an option to export RMD or save it to the clip, but I don't know...