Really like the image scale and composition Peter. It frames nicely. Not certain of the technical aspects of the image but some constructive feedback if I may.
On the hot pixels and column defects, if you aren't dithering between subs (you ultimately should be), build a bad pixel map using MaximDL or similar. This will at least clean the subs for you. Dithering however is far more effective.
You may wish to take shorter subs to manage the stellar profiles so that they don't appear white clipped. You are looking to obtain a bell curve in profile so that colours will come through. Given this is a narrowband image, its probably a mute discussion as stars get in the way. Alas, stars are what make an aesthetic image. May wish to checkout
this post.