Jon Rista has done a lot of research on various 1600 setting and how to configure for high gain narrowband, etc. His CN threads related to the 1600 are worth reading.
I had also heard that ZWO locked Offset, in the later Pro models, because it seemed to be confusing owners, who might be searching for an optimal setup for particular conditions. Happily my Version 1 1600 allows full control, and certainly most software still supports selective Offset.
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