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Hi Frank,
Nice start.
I'd be using a much higher ISO than 400 though. I always used ISO1600 or 3200. Some say to use ISO800 as it gives better dynamic range although in this case you are imaging a dim object and your first target is capture enough signal to get a bright enough image. Photoshop can't sure inadequate signal so use a higher ISO and when you get a chance go for more exposure time.
So whack it up to ISO3200 and if you can go for an hour or more.
Is that a bit of coma occurring in your system or was it tracking errors?
First step there with autoguiding is accurate polar alignment and drift alignment is popular for that.
Greg.
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