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.
Current image processing routines and filters are still as 'dumb' as they were in the early 90s.
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.
Failing to deal with them will lead to a halo effect near the edges of your dataset.
You can convert everything you see to a format you find convenient. Give it a try!