Hi Jacob
What you have acheived is very good.
After a 4 year layoff, you may have had to 'start again'.
As you know, the technicalities are at times overbearing.
Next time, spend your first few subs in framing (in your case, up a bit) and then focusing.
Maybe even rotate the scope if you have to (this requires you take new flats & darks).
And of course, more data!
Keep a reliable backup and then add to it over the years.
10 hours on 6188 would work with your scope.
Achieving star colour is not easy, gain and sub length play a role.
Try different settings and see what works for you.
Great effort