Yes, the hour angle was set very close after crossing Meridian because that was suggested in this thread earlier and for others this is working (Ekos HA 0.02 and in HC 3 deg) - that´s what makes me wonder why settings that work perfectly fine for others aren´t working for my setup. I´m still convinced that it is just a simple thing that I oversee somewhere - either in the HC or in Ekos as I´m having the same issue in different KStars versions and different computers. I did tried other combinations in the HC and Ekos (like suggested by ekos 3deg in Ekos and 5 deg in the HC).

I tested a little bit last night before I was imaging and found that my mount did not changed the pier side from West to East before a Target was about HA 00:52 (0.86) after the meridian what is a bit irritating when the max that did set in the HC was 3 deg past Meridian (HA 0.2) and the overall possible maximum should be 10° (HA 0.67)... I´m maybe a bit confused here.
Will give it another try with more time after the meridian and report again. I don´t give up - I guess at some point we´re laughing about my stupididty ;-)

Cheers, Nico

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