Seeing is a major part of guiding. If the seeing is bad, guiding is bad. Get the app/subscription it's a great way to see what your night has in store for you.?
Just because you go outside and it's still and clear, doesn't mean the seeing is good. Transparency and seeing are not the same. Transparency is basically how clear it is, seeing is what makes the stars twinkle, or not.?
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No 2 setups are the same. My G11 won't behave exactly like your G11, even with the same setup, so there takes some experimentation.?
Try setting your exposure duration to at least 2" maybe as much as 4" to avoid chasing the seeing. Also, I've found that with my G11 L6, and no PEC training done that the Predictive PEC algorithm for RA works best.?
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What matters most, aside from pixel size of your guide camera and focal length of your guidescope being set correctly in PHD2 is the Aggressiveness (Agg) and Minimum move (MnMo) settings at the bottom of the PHD window.? Set the aggressiveness to about 75 on both axis and the MnMo you'll have to play with. I have mine set around .20.
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Aggressiveness at 75 means the command will use 75% of the predicted correction. MnMo at .20 means the star must move 20% of a pixel before it sends a correction.
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If the mount corrects but then overshoots, meaning it has to then quickly pull it back the other way, set the aggressiveness lower, if it sends a lot of commands before the mount corrects, set it higher.?
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Run the calibration assistant, and Guide Assistants as well. Let the guide assistant run for at least 2 worm cycles. The G11 is 240" If I remember correctly, so run it for at least 480". Notice the DEC drift, that's about the best RMS you'll get for that particular night. When the guide assistant run is complete, accept the suggestions, then tweak from there.??
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While the guide assistant is running, your drift should be no more that 1-2 arc/sec over 5minutes on either axis, if it's more, adjust your PA. For DEC, adjust Azimuth, RA, Altitude.
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Mike