You're doing GREAT, for the time you've been at this. That's an unmodded camera????
Be sure to do gradient reduction in processing. From the above image, I assume you are?
Platesolving is the way to go for acquiring the target. I like PlateSolve2. Once you've learned it (and it's one of the easier things to learn), it's fast.
Look at the histogram of a subexposure, either on the back of the camera, or in a terrestrial editing program. Once it's 1/3 of the way over from the left, you gain _nothing_ with a longer exposure. The correct thing then is to shoot more subs. With one of my cameras, a recent image used 150 X 15 seconds, at F2 (which needs less total imaging time). No (not so) magic light pollution filter was used, nor would one have been useful on this target.
320 X 7 seconds would have been better, too many stars are saturated.
Recognize that long total imaging times are required to do this well in light pollution. It's just math, and there's no magic alternative. Over time, signal tends to build, noise tends to average out.
My rule of thumb is one hour minimum, two is better, four is good. My best results come from imaging the same target over multiple nights.
The ultimate solution is a cooled mono astro specific camera, and narrowband filters. But then you are limited to certain targets.
My skies are Red Zone, Bortle 7, mag per arc sec squared low 18s.
That's it, in a nutshell. More details on any of it on request. <smile>
Edited by bobzeq25, 20 August 2019 - 01:07 PM.