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From a quick analysis.
All stars do not have a blue halo, some have yellow halos. This is the true colour of the stars and the centers are blown out to white with the DSLR chip but hard to state as you don't give the length of your exposures. But i would guess they are about 5 min duration.
Stars in the center have uniform images and halos but stars off center are off centered. This is most probably due to an unflat field ie your corrector is not doing its job. Not all correctors will work on all refractors irrespective of the manufacturers claims.
Your scope appears to handle the colour quite well but it would be better to see the whole image and then all 4 corners and a center of a star field with and without corrector. How are you focusing your scope? That can make a great difference to your image.
What was the altitude of the stars as that can intro Duce colour dispersion seen in some of your images.
The guiding looks ok and I think you need to relax a bit about your imaging.
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