Just tried again last night, this time with my Raspberry Pi 4 instead of my Mac. Did a rough polar alignment, forgot to level my tripod etc and then ran the Ekos Polar alignment tool. This time no problems, the crosshair was very close to my selected star and only very small adjustments needed to center the star. I haven’t changed anything in my setup besides changing from Mac to RP4. I’m happy.
SkyWatcher ED80 Pro
Skywatcher HEQ5 Pro with Rowan Belt Mod with EQDIR cable
ZWO ASI294MC Pro imaging camera
QHY5L-II-C guide camera on 50mm guidescope
DeepSkyDad AF3 autofocuser
Raspberry Pi 4 4GB running Kstars/Ekos