HD FCP to SD DVD – been through everything – need help

We're producing a DVD video of the 45th Reunion of the Ford GT40 and can not seem to get quality output from the compressor. The biggest problem is a flickering / shimmering / zig-zag effect on some scenes. Also can't seem to get a clear motion shot of a moving car. Freeze frames are perfect but the car in motion seems a bit blurry. Everything we've tried only seems to make it worse or has no effect. Workflow is from FCP7 → send to Compressor → m2v & ac3 to DVDSP.
We've played with the DVD preset MPEG-2 90 minute Best Quality with Dolby
GOP structure from IBBP to IBP and even IP – no visible effect
Flicker filter in FCP – helped a bunch but didn't fix everything
de-interlacing – better and best – this seemed to create more artifacts than it got rid of
We worked in 1920 x 1080 ProRes HQ and are compressing to 720 x 480 letterbox
Filmed on a Sony FX-7. I have heard some complaints about the FX-7's rolling shutter. I have artifacts in a pan and when a racing car passes across the screen. They are evident in FCP HD ProRes but get highly objectionable on the SD DVD. De-interlacing only seemed to converge a trailing image artifact into a big square blocks pixels. Looks like a comb off the trailing edge of everything moving.
So flicker stays and GOP goes back to IBP but de-interlace only worsened the problem.
Need some guidance, please.
Mark

Try this thread:
http://discussions.apple.com/message.jspa?messageID=10453071#10453071
But if things are moving fast, the two interlace frames are 1/60 of a second apart in time. At 60 miles per hour, thats about one and a half feet! So, if you combine them (deinterlace) you get a sort of unpleasant "blur" maybe with horizontal lines for each new 30p frame.
WIth my V1U, I shoot almost everything in 30p now: no temporal displacemenet, but at the expense of all the blur being in each frame, or judder if my shutter speed is fast (that's when a moving object seems to jump from one place to the next: in the case of a car at 60mph, each 30p frame has the car moving about 3 feet. So, if I shoot at 1/30second shutter, that's a three foot blur, if I shoot at, say, 1/1250second, it freezes the car pretty well, but each from jumps the car about three feet forward.
It's all a compromise.
Eddie O

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