Are you running a tracking mount or fixed tripod Warren? I'm going to guess from the camera settings that you are on a fixed tripod and I'm also going to guess that you are not running a full frame camera. In that case you are really shooting at 80mm with your 50mm lens. The 600 rule for fixed tripods determines the maximum shutter speed length before stars begin to trail to much and it is 600 divided by the true focal length. So for you in this shot 600/80= 7.5 seconds maximum shutter speed. The 600 rule is fine for wide angle shots but because you are trying to capture finer deep sky detail here I would go for a 500 rule (6.25 seconds) or even a 400 rule (5 seconds) to stop the issue of elongated stars like you have here. I would also advise stopping down that lens one or two stops (F/2 or F/2.8) to tighten up the stars at the edges of frame. Now I know that this is going to limit the amount of detail you are going to get in each subframe but that can be dug out again later in post processing as long as you take lots and lots and lots of subs.
Of course if you are running on a tracking mount then things become easier.
Once you get your base data better then you can start worrying about image processing. On that score your colours look ok and you have not blown out the stars to much
Hope this helps a bit.
Cheers
Greg