Kevin.
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For the temperature of the camera at exposure time the dark frame looks ok to me.
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A couple of points, the fan control in the QSI driver setup has user options, set to "Quiet" mode the cooling of the camera will not reach max delta C, which for the 6120 is a maximum of -40c below ambient at 100% cooling.
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Under extreme ambient temperatures you'll need to set the fan speed to Full Speed, and of course, check that the fan control is not currently set to "Off" which would severely impede cooling.
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The small Sunon Maglev fans in the 600 series cameras are known to wear out and fail but are readily obtainable, inexpensive and easy to replace by the owner.
Check that the fans are both spinning, spiders and other bugs are quite happy to set home in the fan openings and stop the fans rotating.
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At your observatory ambient of 30c the maximum that the camera would reach is -10c in ideal conditions, and setting -10c would be difficult to maintain anyway as the cooler system has no headroom for regulation and under these ambient temperature conditions I would recommend setting only -5c.
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Like SBIG, QSI did offer a liquid cooling kit to bolt onto the back of the camera to help cooling under high ambient conditions and that would add another -7c to -10c of delta C.
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If your 6120 doesn't have the optional physical shutter and only the on-sensor electronic shutter (QSI cameras with Sony sensors could be ordered with or without a physical shutter) then you'll need to ensure that no light can enter the camera when taking darks.
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Finally,
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When sharing files on GoogleDrive you can change the share permissions for the file, for a public share you need to set the option under "General access" to "Anyone with the link".
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HTH
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William.
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WILL B