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Matt,
I've been getting the same problem with eggy stars, but not all the time. Seems to depend upon where exactly the mount is pointing. I use GuideDog with EQMOD and an EQ6. I think PHD is OK and the mount is at fault. Read on...
Last week I pulled my EQ6 apart. It's a newish (white) EQ6 with clear grease instead of the infamous black goo.
But... the bearings on the worm shafts were rubbish. The worm shafts would not rotate smoothly, it felt like the bearings had square balls... they'd probably been over-tightened at the factory. Replacing the worm shaft bearings with good quality Japanese units (only a few dollars) has made the shafts rotate smoothly.
The 'stepped' worm rotation and rough bearings would surely have degraded the tracking accuracy of the mount.
In addition, I've replaced the main shaft bearings and re-greased the whole lot with cold temperature synthetic grease. That is another story!
Rob
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