Persistently bad XYZLUT profiles

[p.dada]

Hello,

I’ve been trying to make a correct XYZLUT profile with my Spyder4 to no avail. Measurement Reports turn out excellent, but actual image suffers, especially with posterization in the shadows. Taking a peek at the profile info, you can see some weird things going on with the tone response curves and the gamut boundaries. It really doesn’t matter if I calibrate first or not. It happens to all my monitors and my plasma TV. However, Curves + matrix profiles turn out fine and smooth.

Could you please take a look at the attached profile and 3D LUT and give me any clue? Is it my colorimeter or some setting that I need to change?

Thanks in advance.

3D LUT: https://drive.google.com/file/d/0B5IP2u-96AzYWHI4WDFRSmk3YkE/view?usp=sharing

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[p.dada]

Maybe I spoke too soon. This one actually looks great with movies. I still don’t get the weird curves though…

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