I think this is quite ok really

...nice to see you over-analyse your own images too

(just joking

)...On my work moniter nothing jumps out that looks like a big issue
Sure more exposure might (well,
will) assist but still nice work

...besides without robotic automated sequences really loooong exposures are a bit of a challenge....try doing them without an observatory
It's a lovely image...juuuust begging for a wider field

....
Mike