Lots of great colour and detail. Is it possible that one or two of the stars which look oval are actually a little over exposed and mask another star almost behind?
I have been finding that as the oval stars are surround by round stars.
I will have to try your colimation method
I agree that collimation of an SCT is everything. I have seem some methods on CN that photograph the airy disk and analyse with amazing results but this is too complex for me. I find the simple (straight through high power eyepiece with out of focus rings ) works at my level and can be fine tuned with a Duncan mask , a very bright star and 5mm eyepiece. Try the Duncan mask , it is an interesting use of diffraction if your eyes are good and perfect for an SCT.
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