Very good result!
f you are use Photoshop after DSS you may get an excellent lift from combining short and medium and long duration shots together in batches using layers and a mask. There are a lot of examples on youtube showing you exactly how to do this - its about a 13 step process. This allows you to say stitch 10 second, 30 second, 120 second and 480 seconds shots together without blowing out the core.
https://www.youtube.com/watch?v=K-PC4Sq0Zho How to process M42 using Photoshop Layer Masks - Astrophotography Tutorial
You can use DSS to combine say 10 - 30 shots of similar duration to create masters for in the above example the 10, 30, 120 and 480 second shots. You open one of these master then map in the data from another master - masking out where the first master has started to blow out - and so on until you reach the core. This dramatically improves your image quality when you have a subject like M42 which has such a high dynamic range!
Example 1 - Letting DDS combine say 3 shots (combining a 4 second, 30 second and 180 second shot together) results in core blown
https://www.facebook.com/photo.php?f...type=3&theater
Example 2 - Combine those exact same three shots using layers and masks in Photoshop to integrate them
https://www.facebook.com/photo.php?f...type=3&theater