Here is a link to the final version. Different orientation and much better noise control/reduction.
Preprocessing in Pixinsight - Post processing in StarTools. I noticed that the the Integration tool selection, "Average with Scaling" produced odd results with this set and reverted to "Average" I also increased the High pixel rejection value with Linear Clipping for the cleanest result.
Image was first reduced by half with the StarTools Bin module, which further added to better noise reduction.
If anyone is interested, Star Tools workflow; as follows
EDIT:
Develop/AutoDev
Crop
Bin 50%
Develop 99.5%
Wipe defaults
Develop 99.5%
HDR Reveal - Detail size range 256 - default is 64
Life - Isolate - 4 layer inverted star mask - Power of Inverse
Colour - 150% saturation - Top and Low End Saturation ~6.0
Turn off Tracking and accept default noise reduction.
+ HDR Optimize Brighten Dark; and
Colour Saturation, with 4 layer exclude purple mask
Will add more data to this over time.
http://www.astrobin.com/82477/