Nice photos Peter, you have got the 10" starting to sing
As for your guilding and what alot of people miss/ don't understand is that the calibration is extremely important. Unfortunately most people go woohoo its calibrated i must be able to guide everything perfectly now. *insert game show your wrong buzzer here*
Polar alignment affects your guiding calibration
Wind affects your guiding calibration
Bad seeing affects your guiding calibration
Flexure affects your guiding calibration
So you see
you may not of changed anything but.... you may have gotten things just a little bit better in the alignment/seeing/wind/flexure.
I use maxim so its very easy to see the effects of everything happening and i will not accept the calibration unless i get a near perfect "L" shape. If you get that "L" shape that means that the software knows exactly what angle the camera is on, and more importantly how far to move the mount to correct alignment. As for PHD and the like, if your star ends up perfectly back in the center ever time your guiding will be very good. if it doesn't your guiding will be average at best!
Brendan
