Image Brightness Changes When Authoring DVDs

Hello,
To encode footage I export 720 24p footage from FCP as a Quicktime .mov using Microcosm then encode in Compressor using the standard Best Quality, 16:9, SD setting. The Quicktime .mov and the encoded .m2v file plays with the same image brightness and contrast as does the original footage in the FCP timeline, but once I author it in Studio Pro it consistenly looks lighter and consequently washed out when played back on the same monitor from the DVD. It also ends up looking lighter when played on a TV than programs from a typical rental DVD movie.
I set up my 23" Cine display carefully with with Apple's advanced profiling software, and images and color bars match footage displayed on my Sony PVM-14M that has been set up with color bars through a decklink card.
Can anyone offer advice about why this may be happening? So far my only fix is to arbitrarely change image brightness when encoding with Compressor. Is there some change I should be making in FCP to go from 720 24p HD footage to SD encodes?
Thanks,
Drew Harty
G5 dual 1.8 Mac OS X (10.4.9)

I have read on various forums that people are getting better encodes from HD footage by exporting to a Quicktime file before encoding. Several people have complained about the results exporting directly to Compressor. I take it you haven't found this to be a problem?
Drew

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