After all the problems encountered here, some good news. Finally after 2 months we had a couple of good nights. I was using Asiair Rigs. One with 1600mm FL and one with 200mm FL. Both setups with all accessiries. 3 nights run straight without a problem.
Guiding with the 1600mm FL scope was consistently around 0.5“ total RMS with the AM7.
Only the dark guiding screen issue keeps popping up for me. It seems difficult to fix. But it does not seem to affect guiding quality, so I stop worrying about this.
So version 3.0 works very well for me.
Cheers,
Stephan