In PM, you start with rotating the template around Polaris and then picking a star (other than polaris) whose rotation is tracked. My experience has been that the outermost star I pick leads to an improved PA leading me to the conclusion that the step where you select the axis centre is important (everything else then is tailored to moving your
The difference is very tiny IMO. I can easily go seven minutes unguided at
If you're doing guided imaging you probably don't need to worry about this but if you're doing unguided then this should help IMO.
--Ram
* - In a