Launch AutoDev to help inspect the data. Chances are that the image looks terrible, which is - believe it or not - the point. In the presence of problems in the data, AutoDev will show these problems until they are dealt with. Because StarTools constantly tries to make sense of your data, StarTools is very sensitive to artefacts, meaning anything that is not real celestial detail (such as stacking artefacts, dust donuts, gradients, terrestrial scenery, etc.). Just 'Keep' the result. StarTools, thanks to Tracking, will allow us to redo the stretch later on.
At this point, things to look out for are;
Thank you StarTools for turning my average photos into amazing ones.
AutoDev finds the best compromise global curve, given what detail is visible in your image and your preferences.
Once all issues are fixed, launch AutoDev again and tell it to 'redo' the stretch.
You can convert everything you see to a format you find convenient. Give it a try!