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Nice images. Make sure you image with the camera files set to RAW not jpeg.
RAW means just that - lossless data, no changes to the original - raw.
Jpeg is compressed and can introduce artifacts and you lose some data.
Eta is a bit too magenta. So colour processing where you reduce the blue a bit would correct that.
Images Plus is the software that is most sophisticated for DSLRs. If you don't have that you should plan on getting it. Its a wonderful piece of software that will enable you to handle all aspects of your images from acquisition to darks/flats, aligning/combining and processing the final stacked image.
Your images are light years ahead of mine at that stage.
Tracking is good but not perfect. Your polar alignment was probably a bit off. Did you do a drift alignment? Its worth learning how to do it well as it saves a lot of other troubles with guiding.
Cheers,
Greg.
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