Proper stacking isn't always that easy, but DSS helps.
Looks to be a bit of noise, and the Focus and Tracking look off, I think that's why your stars look blown out.. The stars should appear as small pin points of light, especially with a small short focal length lens. Some of that could also be due to poor seeing and transparency.
What ISO did you have the camera set on?
Generally I use ISO 800 which I have found to be the optimal setting for either of my Canon DSLR's
Are you saving and stacking your RAW files?
Save RAW and stack your RAW files.
When DSS finished stacking and loaded the autosave.tif, did you make any adjustments using DSS? Don't make any color or luminance adjustments using DSS. Save all that for further post-processing in something like Photoshop.
how did you save your file from DSS; With or without changes applied?
Save as a 16 bit tif with "Changes Embedded" so you can complete post processing in Photoshop or similar.
Did you do any further post-processing in photoshop or similar software?
Looking at the red rings around the stars it appears as though you cranked up the reds trying to bring out the nebula, and that can be another cause for some of that noise (color noise). If you got good image data, and plenty of it, you shouldn't have to crank it up like that. Additionally, be careful not to over clip the dark points; A mistake many of us still make.