31 May 2021: APP 1.083-beta2 has been released ! APP 1.083 stable will follow soon afterwards. It includes a completely new Star Reducer Tool, New File Saver Module, Improved Comet registration and much more, check the release notes here!
I used the sigma rejection and if you look well one can still the satellite trails.
What is the best filter to use?
That will depend on the number of lights, if you look at the tooltips for those you can see an explanation which one to use. If it's not completely removed, you either stack more data or you do a more aggressive rejection (which can hurt the data, so step wise testing is the best). You can manually set the rejection for high kappa, lower then what is set as standard. I would decrease that with steps of 0.5 to 1.0 at a time.