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Hi Russ,
Your stars are elongated. I don't know if this is tracking or misregistration. If it's tracking you may need to take shorter exposures. Misregistration can be fixed in CCDStack by better selection of the reistration stars, DON'T use saturated stars, smaller ones are usually best as the centroid is better defined. Starsnap in CCDstack works best with roughly aligned images, for subs you can turn off the scale function and just use the rotate and shift functions. Sometimes the different colours require a little scaling though, particularly if there's a focus shift.
Cheers
Stuart
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