When exporting to Quicktime, areas in shadows are grainy and pixelated

Shot short film on Canon HD (AH A1) 16:9 24fps. Looks great in the editor, however I cannot seem to figure out the settings to export to Quicktime so that I have a nice clear picture when blown up to large format (50" plasma and larger format, i.e. movie theater screen)
Anything in a shadow looks grainy and pixelated when exported.
I need help with my size, codec, data rate, frame rate etc. If anyone has the magic combination please let me know. I am on a deadline. Thanks!

Hello Nick Holmes,
thanks for the reply.
I deleted all the rendering files (using Rendering Manager) from the sequence and I rerender it again using ALT+R.
Nothing has changed. Corrupted pixels are still there.
So I created a new HDV 1080/50i Sequence in which I put only one HDV clip imported from the camera by FCPX.
I exported that in 4 different ways:
QT Reference Movie – Corrupted pixels;
QT Movie Self-Contained – The same corrupted pixels as above;
QT Movie Self-Cont + Recompress All Frames – No corrupted pixels;
QT Conversion to Apple Pro Res 422 – No corrupted pixels but different colors (due to Single Field).
The clip I put in the Test Sequence has not need to be rendered: I can edit and play it natively.
I also tried to export a part of the original sequence I'm working on.
That's odd: parts that needed to be rendered (text) are great, HDV footage has still that issue.
I don't seriously understand. Should I transcode my HDV footage to Apple Pro Res 422 and always use that codec in my future HDV workflows?
Thanks in advance.
Alessandro.

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When exporting to Quicktime, areas in shadows are grainy and pixelated

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