Wow, an Edge HD1400 - that should hold a lot of promise.
As far as reducers go - apart from a factory designed one for that specific scope you may have luck with the AP67 flattener that is used on RCOS scopes for smaller chip (up to ST10) sized cameras.
You certainly got some nice close up image scale going there. The reducer is clearly not working. Same with my TEC180 - my Tak reducer setup kind of works but leaves stars a bit wonky in the corners of the image.
Probably the more expensive Tak reducer - would work for me. You are in the same boat - a bit of trial and error. I am sure one will work.
My best guess is the AP67 2.7 inch reducer.
Greg.
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