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KVCD: Best method for removing blockiness in still/dark areas?

I just finished an encode with shocking quality results with one irritating exception - gnarly blocks will appear on certain solid surfaces and darkly lit scenes!! This is nothing new, of course, but I was looking for recommendations from you guys on the best way to ameliorate that problem...

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current script
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AviSource("something",false)
ConverttoYUY2
LegalClip()
GripCrop(528, 480, overscan=2, source_anamorphic=false)
GripSize(resizer="BicubicResize")
SpaceDust()
sharpen(0.7)
FluxSmooth(temporal_threshold=7, spatial_threshold=7)
TemporalCleaner(ythresh=5, cthresh=10)
BlockBuster(method="noise", detail_min=1, detail_max=7, variance=0.3, seed=1)
GripBorders()
LegalClip()
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I was thinking maybe dropping the CQ a few points (from 85) to make room for a higher minimum bitrate. Just an idea.

IME this script:

Code:

PixieDust()

sharpen(0.7)

mergechroma(blur(1.58))

mergeluma(blur(0.7))

...does a pretty good job at eliminating moving blocks in dark/flat surfaces. Havent tried the latest script but it would probably do a good job too.