Clean 16:9 export?

I've been having a problem with exporting a clean 16:9 SD movie. I edit on CS4 Premiere Pro and use the Adobe Media Encoder. I shoot all my vid on the DVX-100B in Squeeze mode. When it comes time to export the movie in an H264 codec, I can never get an export without having some sort of letterboxing or pixelation occurring in the final movie. I have tried all sorts of settings and lately have just resorted to exporting projects in 4:3 to ensure a quality-looking export. Does anyone have a 16:9 SD setting that works for them that you can share? Thanks in advance!
 
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