Update:
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I got sub arc second guiding with Easytrack and Autoguide when i was out a few days ago: (Graph uploaded on Astrobin)
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Even though it is possible to calibrate (with a warning from PHD2 after the result) and also guide at the celestial equator, i get? a much better calibration at for example 60 degrees azimuth and 30-40 degrees in altitude. Probably beacuse the Altitude rate is almost zero at the celestial equator.
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It's probably best to calibrate at the same azimuth as the object that will be imaged and at 30-40 degrees above the horizon with dec compensation.
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The key to get a good calibration in PHD2 is to make sure it uses 8-12 steps per axis. With 6 arc seconds per second in ServoCAT Sky for the GUIDE 2 value and a calibration step size of around 5000 ms (pulse) results in 8-12 steps.
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If the calibration step size is say 2300 ms you simple change the guidespeed x sidereal in the box above when on the guiding tab in PHD2 untill you get a step size of around 5000ms (not necessary to create a new profile). However, if i was to lower or increase the GUIDE 2 value in ServoCAT Sky, 5000ms steps size would no longer result in 8-12 steps. Also not sure if the GUIDE 2 value on a Starstructure would translate to other dobs.
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Here is how my latest calibration looks like:
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/Gabriel
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Gabriel Wiklund