OK, thanks. I was not aware of the distinction in the past. My mistake.
So I looked at the graph again, and it’s much what I thought. Perk five just seems far better. Perk three seems pretty good too. Perk four look like a step backwards.
This may explain some of the frustration and missed goals in the last few years. Perk 4s sub-par performance may have thrown them for a loop and yet once again, they may have come out with something better when they developed Perk5 to get them moving forward again