I exchanged emails with Holley tech on this subject and they do not recommend using progressive linkage with the Sniper. It sounds to me like the software isn't really ready for users to check that box.

Checking the progressive linkage box on my Sniper didn't appear to make any changes to the underlying tables. I went thru the tune after changing to progressive linkage and I do not see any changes to the tables. I might have missed something somewhere but I can pull the before and after tunes up and look them over and nothing jumps out to me.