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Looking at you first image, it seems that the distortion irradiates from the center towards ALL the four corners; therefore it is most likely that you'll need a coma corrector to be able to "fix" this issue
Others more informed that I would probably jump in and let you know if my opinion is incorrect though
Good attempt and looks great - best to get auto-guiding going as it be giving you more imaging time per shot
HTH
Cheers
Bill
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