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Lee I don't use Pixinsight but I imagine there is a menu that has combining methods to stack data. Summing is a stacking method. Perhaps take a look around for that.
I also urge you to start looking at automated focusing too. It is much more accurate and will produce sharp data for you.
The focus while it might have been sharp to begin with, actually has moved throughout your imaging session. So you probably got it right from the beginning but the tube has contracted over the course of the session and hence why your focus has drifted. To alleviate this initially I recommend you use a bahtinov mask every 40 minutes or so to check focus on a bright star near the meridian. To get the scope back to the same spot again take note of the star field for your guide camera. Ensure your goto's are accurate and place the scope back in the same spot by nudging. It might take 10 minutes or so but will give you sharp detail a lot of the time. When you are ready you can go to automated focusing.
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