This is a tough target I found. I captured 7.5 hours and it still looks dim to me. I would expect that I would need to capture 15 hours to double the brightness of this galaxy.
I would suggest that you might like to have a go at Ken Crawfords tutorial on sharpening. The data looks a little black clipped in this image. Stars are nice and uniform (shame I cannot boast the same) too.
|