Congratulations Nick this is a great image... I like your colour balance and presentation.
and with only 8sec exposures..!
You should be very happy this.
Keep working on that alignment. If you can get it just right I am sure you will be able to take some longer exposures. The best thing that I did recently was use StarTarg, it not only helped me understand drift alignment it actually works! Try this website for more information:
http://www.andysshotglass.com/StarTarg.html
I think that there have been some recent postings about StarTarg and a similar but free executable that was developed by anther ice-in-space member.