You could be right, but I did restart SGP and I was still getting settling even though the dither checkbox was unchecked after opening, but maybe SGP was still using the setting in the profile - I didn't Save the profile with dither off.
But of course, using PHD independently of SGP makes sense. No need to have SGP connected if I'm not dithering! If my polar alignment isn't perfect, I have a form of dithering anyway due to my polar alignment drift.
That's a definite solution,
Keith