Poor DV Output

I've been asked to render out a DV/DVCPRO-NTSC file. When I render with Compressor I get absolutely shocking results.
I know DV compression isn't great but when I render the exact same file through another encoding application (ProCoder v3) using the with the exact same settings I get a far superior encode. The file encoded through Compressor exhibits a very noticeable increase in blocking and aliasing.
Settings Used:
DV/DVCPRO-NTSC
29.97
Quality = Best
Scan Mode = Progressive
Aspect Ratio = 16:9
I also realise that 'shocking' and 'superior' are very subjective terms...but the difference is so extreme that I would not send out the file created through compressor because I know the client would complain.
Has anyone experienced this? If so is there any way to improving the quality when rendering out DV from Compressor.
Many thanks for any assistance you can provide.
Regards

Thanks for the suggestions.
I ran a few 30 second tests.
1) Using the settings in the frame controls section you suggested.
2) One with all settings bumped up to 'BEST'
3) One with all settinsg bumped up to 'BEST' and 'Anti-Alias' increased to 100.
There was a slight improvement with these tests but you would have to be looking very hard to see it. ProCoder still beats it.
The odd thing is the preview window in Compressor looks great (looks exactly like the output from ProCoder). I'm relatively new to Compressor so I'm not entirely sure how reliable that preview window is.
A difference that I noticed between the 2 applications is that when selecting the DV codec in ProCoder it is explicitly labelled as "Apple DV/DVCPRO-NTSC". However through Compressor it's just DV/DVCPRO-NTSC.
One other thing that I thought might be worth mentioning is, when played back on a PC and I view the movie inspector the format is detected as 'DV/DVCPRO-NTSC' for both PC/MAC encoded files. When played back on the MAC format for both is detected as BlackmagicDV...could it be that Compressor is using a different 'implementation' of the DV-DVCPRO-NTSC codec to that of ProCoder?
Thanks again for the assistance.

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