Gonzothegreat wrote: To get round stars, it's a combination of a lot of things I think.
mount accuracy, is there any backlash? Can you fix it, or minimise it?
telescope balanced?
polar alignment, try to get the best you can with the Kstars PA tool

imaging train must set correctly, back-focus all good?
Focusing
do you have a field flattener?
guiding, are you using the multi-stars option?


Spend some time on the mechanical part first, make sure everything is sound and working as it should. I did tune my mount, I took everything apart and changed some dead bearings etc... I have a post about it somewhere here.

Then spend some time on the telescope part.
and finally, on the software side.

Here's a very good youTube channel with tons of tips www.youtube.com/c/CuivTheLazyGeek