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Did you do an alignment, then ASPA, then another alignment? After adjusting the wedge to get polar aligned (ASPA) you need to do the second alignment.
Also for long exposure imaging you'll need to get into guiding which will take care of any small errors in polar alignment and inaccuracies in the gears. Without guiding you might still get decent images up to a minute.
I haven't operated my mounts with an external computer so I can't help with the stellarium/HC problem.
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