Good morning, I also have the same problems.
I have a 70 / 420mm apo and I use an ASI183mm. I set the focal length correctly (which I checked for security with another software on an image taken). I tried to shoot as recommended in the manual, trying with shots from 1 second, 2 seconds, 5 seconds, 30 seconds in bin 4 bin2 bin3 bin1 but does not solve the image, it signals to me once that there are few stars (but it finds even more than 1000, the minimum value of stars that I had er of 600, or to control the focal length, but the focal is correct, how can I solve it?