Good to see you enjoying the process Malcolm, more subs on that widefield and things would be looking brighter.
So are you on a tripod or have you got it mounted to the EQ2?
Might I recommend trying 15secs @ ISO800 or even 5secs @ ISO1600 to help keep the stars rounder, they don't look too bad at that image scale but a larger image must be showing some egging at 30 seconds.
Repositioning the tripod/mount can give you a rough & ready tracking but Registax may have trouble getting alignment...DeepSkyStacker however has no problems with it.
Looking forward to your next efforts.
Justin