It’s interesting to read that the problems with astrometery are nothing new! It is probably the sole advantage of DSLR imaging over video. The precision is vastly better! Talking to Felix about the LCD shutters he tells me that this issue was one of the drivers for trying them despite their optical limitations.
I ran the LCD system I have for ~2 hours through the wee hours of Sunday morning but didn’t catch anything. Despite the near full moon and essentially twilight conditions through the night at my latitude, the DSLR images looked much better than I anticipated given the sky brightness. The only concession I made was reducing the ISO from 1600 to 800.
We’ll see how it goes.