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Definitely tilt and perhaps some spacing issue with the reducer.
Reducers are more fussy with regards to spacing than flatteners.
This hi res sensor will pick up more errors than other more forgiving sensors.
You should contact Joshua Bunn on this site and he can make you a custom adapter. I use him all the time, he's great and the main advantage for him over Precise Parts apart from he is cheaper is Ashley uses an auto adapter maker on his site and if you get it wrong too bad.
Josh really makes sure he understands what is needed before anything is made. He backs up his products.
Get a solid adapter made up as you are going nowhere until you have a solid square connection.
Then play with tilt. If you are able to insert shims to do the packing in your setup that will be easier than those 3 screw push pull systems which I have found difficult to use in the past.
By the way those images look terrific so its well worth the time and effort.
I am about to go through the same process but with a QHY600m. The QHY is known to be more precise with sensor levelling and there are several posts on Cloudy Nights complaining about ZWO poor levelling of sensors in the 6200. But its all correctable so don't fret.
Greg.
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