Switch Tracking off and apply noise reduction. You will now see what all the "signal evolution Tracking" fuss is about, as StarTools seems to know exactly where the noise exists in your image, snuffing it out. The most important parameters to tweak are Smoothness, in combination with Grain Dispersion.
Tracking how you process your data also allows the noise reduction routines in StarTools to achieve superior results.
To establish this baseline, increase the 'Grain size' parameter until no noise grain of any size can be seen any longer.
This way, nasty noise surprises when viewing the image at 100% are avoided.
You can convert everything you see to a format you find convenient. Give it a try!