Hmmmm, Matty, that dosn't look good, firstly are you pretty right on with polar alignment, this is fairly important.
It could also be a balance issue, probably worth checking out, it all comes down to illiminating things in steps, if those are both good, then we have to look at other issues.
Binding motors can also cause this are the pretty free, to your knowledge.
If this is good as well, what guiding rate are you using, maybe it is to long in between corrections, I used to use 1.5.
PHD is usually quite forgiving and usually works very well, and another though have you set your mount in photo mode or the appropiate mode for guiding, it won't do very well if in siderial mode.
Just keep posting and asking I'm sure some one will help you out.
Leon
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