I used to set mine at gain = 3 and offset = 120 on the old power board. When this was replaced (my fault) and the camera returned it calibrated best to the levels I use now 15 and 115 respectively. So there is going to be lots of differences between individual cameras if the same camera can vary so much. On my current settings min = 450ADU and max = 65480 ADU which is about as good a dynamic range as I am going to get. Interesting that you were told to lift the gain above saturation, I have always been told to stay just below it so you have the max dynamic range with the min noise.
Mark
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