I also have a GM811, which I received new in March 2022. I typically have RA/DEC guiding at ~1.5 ratio (or worse), with total RMS typically about 0.8 arcsec. I¡¯ve occasionally gotten my total RMS down to 0.5 or slightly below with the RA and DEC sometimes similar, but not always. I¡¯m gaining experience in balancing the mount and cable management. As for PHD2, i use multi-star tracking with predictive PEC.
John
