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You mentioned using the white T shirt for sky flats , are you using a white T shirt for the light box ??
I use a few different sized Huion dimmable led light panels and a white T shirt is a must to eliminate low brightness micro flicker and provide a even flat field.
Most of these LED panels and light boxes have a constant voltage ( not constant current) power supply which can cause issues at low illumination levels.
Just a thought !!
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