In your case the biggest improvement would come from getting a ZWO camera to suit your setup.
Probably the ASI600mm Pro mono camera with filter wheel and off axis guider.
It would be a big jump from your DSLR. Your guiding seems fine.
Look at some of the F4 10 inch Newt and ASI1600 or ASI183mm images on this site. They are about as good as images get.
Greg.
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