Hi JP
Love that you're shooting film
Although you're making a rod for your own back, haha. I wouldn't have a clue how to focus with a telescope using a film camera! The last time I used one was 2005 at least.
That said, besides the coma issues, you've also got stars going in the same direction, which to me indicates an issue with both polar aligning and lack of guiding. The second requires cash investment, but the first can be done as you are now (although what mount do you have?)
Nail those points and you'll have some cracking data to share. I really look forward to seeing more film pictures, that's for sure!