I am impressed with the ease of working with the package compared to MaxIm DL Pro 5, PI and PSCS2/3/4 with which I am very familiar.
In your final image, noise is worse in some areas, less in others.
This StarTools.log file is located in the same folder as the executables.
Through the Compose module, StarTools is able to process luminance and color information separately, yet simultaneously.
You can convert everything you see to a format you find convenient. Give it a try!