Hi Gavin
Well for a first go not a bad effort, I am not an expert on this matter but maybe try a 2x barlow and more frames, I know some people who get up to 10k frames and produce great images with the newer cams that are around.
You are never going to produce images like some do on these forums with a small scope, but in saying that you still will be able to get better with what you have it is trial and error, Just keep working at it mate you know the old saying buy a bigger scope
just joking there, but you will learn as you go have seen stunning images with that webcam on small scopes.
cheers
Graeme.