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Constructive comments here we go. When checking tracking accuracy use
the fainter stars, as brighter ones can blot out tracking error and remain circular when fainter ones are clearly elongated. Having said that, your stars are elongated about 11.30pm to 5.30am; I'm guessing that your subs are nearly twice as long as your focal length will allow whilst retaining round stars when unguided, assuming same PA accurac as attained with this image.
Much more importantly, When magnified, the stars at left are clearly out of focus, showing the black shadow of the secondary at their centres, but the
stars at right don't show the black shadows suggesting some camera tilt.
You'll never get images that will satisfy you until your stars are round.
The colour is very muted for my taste, but I'm guessing the CLS filter is at
least partially responsible for that. I gave up using mine, didn't like the
colour cast it introduced. Hope this helped.
raymo
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