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I just had a close look at your image, if you look at the star shapes there's a bump to the right of all the stars, this is indicative of a guiding issue, this may just be one or two frames that have a trailed star, this could happen just due to a tiny bit of cloud popping over or even the settings in phd. Check all your light frames before you stack, just for a trial try using deepskystacker as when you load up your lights you can click on each of them and see which are best..... Also if you have lots of lights you can do an initial stack then go back to the stacking process and using the HWFM column cull out the worst images and restack.
For phd guiding, once it's calibrated, just watch the guiding on the screen if it's constantly overshooting then back off the RA aggression.
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