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Its the same with a high end mount perhaps not as much shifting. Any mount has PE. It tends to look like a sine wave when smoothed right down with wiggles within the sine wave.
So a system that works on a trend line could at first show part of the curve up or down of the PE and it would be a false reading.
Only after its been averaged for a while would that become more accurate.
Pempro works the same with a trend line being formed on the basis of the plotted guide errors. The instructions for that clearly state it may need to run for a little while to determine an accurate trend line. However its pretty clear if you are a long way off. To get it so the trendline is level (the goal) it has to be very close to correct PA.
I haven't used PHD2 PA but I see the trendlines available in the guide error graphs. It may even be faster than Pempro if it shows both RA and Dec trendlines at the same time if that is possible without slewing to different parts of the sky.
Greg.
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