Chris, what you’re seeing there is a diffraction pattern caused by the micro lens’ on the ASI1600 and it’s lack of an anti-reflective coating.
https://www.astrobin.com/full/321338/0/
Mine shows the same artefact. Yours looks like it has some other issues as well (tilt) but it is quintessentially the same thing.
The only fix for this issue is to get a new camera that has AR coatings. We can blame Panasonic for making it this way, not something QHY or ZWO can fix.