I have never ever changed any DSS settings from the standard. I have very rarely seen that message regarding only one frame to stack. Have you run the sub files through the Image Grader first, to assess the relatively quality?
https://www.sequencegeneratorpro.com...-image-grader/
BTW star detection threshold should not be that low, try 25% min. But it depend on the target and relative population of stars in the field of view. Your effectively selecting the number of stars to register against.
Have you read through the DSS technical guide:
http://deepskystacker.free.fr/english/technical.htm