I am not sure i understood you.
Maybe name of `setWrapLimitRange` is misleading. It doesn't change how long softwrap should backtrack before braking in the middle of the word (which is hardcoded to ten).
With setWrapLimitRange 60,80 if window width is > 80 text will be wrapped at 80, if it's <60 text will be wrapped at 60, and if it's in between text will be wrapped to window length.