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I didnt have time to do all of them, bu I can confirm D does not have artifacts for me (asus chromebox 2014)    

Do you have custom configured OVERSCAN values? E.g. in kodi's gui calibration? Can you reset them please?    

 Hi Fritsch,
Woud this be considered custom settings?

Code:

    <resolutions>
        <resolution>
            <description>1920x1080@ 60.00 - Full Screen</description>
            <subtitles>1015</subtitles>
            <pixelratio>1.000000</pixelratio>
            <refreshrate>60.000000</refreshrate>
            <output>HDMI1</output>
            <xrandrid>0x48</xrandrid>
            <overscan>
                <left>21</left>
                <top>13</top>
                <right>1826</right>
                <bottom>1054</bottom>
            </overscan>
        </resolution>
        <resolution>
            <description>HDMI1: 1920x1080 @ 60.00Hz</description>
            <subtitles>1042</subtitles>
            <pixelratio>1.000000</pixelratio>
            <refreshrate>60.000000</refreshrate>
            <output>HDMI1</output>
            <xrandrid>0x48</xrandrid>
            <overscan>
                <left>0</left>
                <top>0</top>
                <right>1920</right>
                <bottom>1080</bottom>
            </overscan>
        </resolution>

I do remember back in the days you had some special settings for this chipset and hw scaling and something i believe with 20% etc, I cannot find that in the current version though anymore. This is a snippit from guisettings.xml 

Ok ill drop it tomorrow.
  Latest nightly didnt fix the problem. I am back to "d" for now and drop the guisettings.xml stuff tomorrow for further test