Good effort considering the equipment your using. Coma of course is evident in the sides. If your going to go to an EQ mounted newt then invest in a good coma corrector, the Baader MPCC is ideal for newt photos.
Re the scope size choice, try to limit the scope net weight to around 15kg on a NEQ6. I have the same mount, albeit on a pier, but imaging capacity should be kept under 18kg max despite the stated visual payload capacity. This gives you room for your camera and a guidescope setup ( which you will need at some point). A 10" production newt with a steel tube might be a little to heavy with all the extras but i am sure many people are using them. I have a 10" f5 newt i use on mine but it is a custom lightweight build using carbon fibre struts and weighs less than 15kg. Just ask about the OTA net weight before you purchase. A carbon fibre tube newt might be a good choice to reduce weight and maximise aperture but they are more expensive.
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