Thanks for all the great information @outerground that link on the 500 is the best explanation I have seen on this tricky topic.
I've been experimenting with various settings but this should make things a lot more precise.

The tracking mount that I'm thinking about is one that I could use for astrophotography and daytime time lapse.
I've got my son's remote control but haven't used it yet. I'm still getting my head around the basics of focusing. :-)
I heard about the stacking software from @astrophoto.kevin too. I'll give it a go on the next clear night.
Thanks again for the info much appreciated. Glad you liked this post. :-)