Yup, I had a screw loose alright. Kept thinking WHY is it so noisy...
Well...ahem...errr....ever taken bias frames with the light box still on? No? Go on, admit it...
OK, I did a repro WITHOUT Bias (so the flats are carpy now), and it is 1000000X better.
I'll upload the degoof later.
Meanwhile, I'll go slap myself silly again.
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