I have been shooting in narrowband only since I got my ZWO ASI1600mm Pro. When taking flats, I usually go for a median ADU value of 32k, which I am now thinking is too high. I have not seen a problem (at least I didn't think I did) with narrowband, but I think my LRGB frames (especially L) are being overcorrected. I thought that it was supposed to be half of the max ADU value, but the more research I do, I haven't been able to find more than 1 or 2 people who shoot above 30k.
Most of what I see is people are taking flats between 12k and 22k ADU values. So this is a question for ZWO ASI1600mm Pro or similar camera owners:
What ADU value do you aim for when using