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Sounds like collimation a bit off! Put in a camera - even a DSLR, take some shots. Download the trial 30 day version of CCD Inspector V2 (from CCDWare) and check how far off your collimation is over 5 - 10 short shots taken over a half a dozen spots in the sky.
CCDInspector will definitely tell you how much tilt (and in what direction) is in your mirrors current collimation attempt and if the mirrors shift or flex as the scope slews around the sky you'll be able to spot this too!
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