There hasn't been much talk about Intel CPU steppings in something like 10 years.
There was a time, about 15 years ago, where AMD and Intel often had performance-oriented steppings. For most of the past 10 years though, steppings have been focused on fixing bugs/errata.
If you want a Skylake "stepping" with potentially significant performance enhancements, that would be Cannonlake "Skylake Refresh" next year. Any steppings before that will be tiny incremental impovements not worth losing sleep on.