David,
Without even looking at your logs, it appears you are on the right path. For a scope of this focal length, this guiding should be more than good. Now you may be in the way of just tweaking PHD2 settings for best performance. You probably have the PHD2 troubleshooting guide already.? As far as Dec going off sometimes you might be able to attribute to atmospheric turbulence, increasing exposure to 1.5 or 2 may help. My guiding error can range from 1.0 at 30 degrees altitude to 0.5 or less at the zenith on the same night. My Dec balance is always camera heavy. If you are too well balanced you could be bouncing back and forth between gear faces and having some Dec oscillations. The majority of your scatter plots are nicely centered, and your stars are pretty round as far as I can see. You seem to be set for doing some nice imaging going forward. Image quality is more satisfying to me than chasing numerical perfections :).
Good luck!??
