H2.64 export settings - Muddy, grainy exports Why!

Exports from QuickTime show no consistency?!?!?
I am using a Canon Powershot SD700 camera to shoot simple videos of friends mountain biking. The format is Apple OpenDML JPEG, 640x480, millions of colors, at 30fps.
The files are AVI which I import into iMovie 6.0.3 as DV format.
Granted the quality is just ok, but I need a very small, inexpensive camera that I can keep at the ready for crash footage, and it does what I need.
The AVI file is about 20MB for 10 seconds of footage (Data rate=14.82 mbits/sec)
For exporting I have been using the “Movie to QuickTime Movie” Broadband – High setting to produce 480x360 files. A two minute video with AAC stereo music included comes out to a 12MB file for 2 minutes of footage.
Here is an example of one of my videos and the quality I find acceptable for the web while still retaining some details.
http://www.joybean.com/BeansBikes/Moviesfiles/Sprain_Beat_Down2006.mov
The last few movies I have shot and created, using the same camera, computer and software have looked extremely fuzzy and blurry, when exported at the same settings.
So I took some original media from last year and re-imported it into iMovie. Did an export, and the new and old movie files looked exactly the same!
So it doesn’t look like the OS, iMovie or QuickTime has anything to do with it.
But this movie, where the original media files look clean (and shot on the same camera as the file above), has come out looking like garbage. Very muddy is the words I use to describe the midtones.
The data rate on both of these post files is just about 800 kbits/sec. Both are AAC stereo, 480x360, Millions H.264, 30fps.
http://www.joybean.com/BeansBikes/Moviesfiles/Rocky_Point6-22-2007bbhigh.mov
I have spent the better part of 8 hours testing different export settings to get the quality back to what I think is acceptable. Right now I am exporting at the default LAN/Intranet setting and changing the size back down to 480x360. Unfortunately the file size is twice what I was putting up previously.
Some other examples are at:
http://www.joybean.com/BeansBikes/Movies_files/
I appreciate any guidance an this, as I am totally stumped.
2x2.66 Dual Corre Mac OS X (10.4.10)

A couple of thoughts...
• Think like a codec for a minute. When compressing video, encountering a tree with fluttering leaves is as bad as life gets.
• The "bad" videos were shot on bright, sunny, breezy days in a leaf-filled forest. That created a perfect storm of hard-to-compress video. The background is filled with dappled sunlight falling on in-motion leaves. There are scarcely two adjacent pixels the same from one frame to the next. It's very difficult for the camera to shoot well — the bright areas blow out and shadows go dark. Even harder to compress.
• The "good" video was shot on cloudy, hazy, shade-free days in the fall or winter. The forest has few leaves. The light is "flat" so there are many adjacent areas that are similar. It's much easier to shoot; much easier to compress.
• Although there's a huge difference in the "blotchiness" of these videos, there's not a great deal of difference in the appearance of the riders. Riders ride fast in all the videos, yet their images are consistently good. That too suggests it is the background content causing the problem.
My guess is that when compressing the "bad" video it will be necessary to increase the data rate significantly. It might also help to increase the number of key frames. Probably both.
I'd start by setting both the data rate and the key frames to the max, just to see what you get. If it looks pretty good, then try turning them down until the video starts going mushy.
Fortunately, you don't need to export the entire video to test various export settings. The content is consistent, so you can test your export settings on a small chunk. Five seconds should be enough.
Karl

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better calculations, some of the pictures here
http://homepage.mac.com/jonwilson/brittaney/ are
sharpened just a bit too much,(most notably 1,2,3,&
7)i found a few other posts that have this problem
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it does this. now that Joe has arrived, maybe he can
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