DVCPROHD to SD - Interlace and Banding

I have searched the forums for days regarding this issue and haven't come up with a complete answer.
I am mastering a series of commercials shot on a Panasonic DVCPROHD camera at 720p 59.94. The final output has been on a SD Beta Tape.
I am editing all these spots in a 720p HD 59.94 timeline and use an AJA Kona LHe card for letterbox output to my beta deck with great looking results. However, every fine line in the footage produces horrible looking banding and buzzing when the camera pans or tilts. I have tried all the tricks - flicker filter, adding a second layer with overlay and adding guassian blur... you name it.
I am convinced that the solution is in the settings. Maybe field order? Maybe going from progressive to interlaced yields crappy results all the time. I don't understand how all of these TV shows and spots shot on HD and mastered to SD look OK.
What has everyone here been doing in this situation?

A couple of things might be worth trying. Try dropping your sequence into a SD sequence and render it and see how that outputs. Or export a selfcontained qt with sequence settings and use compressor to downconvert.

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       dvatransport.dll   DVA Product   7.0.0  
       dvaunittesting.dll   DVA Product   7.0.0  
       dynamiclink.dll   DVA Product   7.0.0  
       ExtendScript.dll   ExtendScript 2013/03/21-12:10:31   79.535742   79.535742
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       Colored Pencil 14.1.2
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       Craquelure 14.1.2
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       Dry Brush 14.1.2
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