The 25% just refers to the line pressure. Meaning how HARD your transmission is shifting. In the cortex setting it'll have options for increasing your shift points by 100, 150, 200rpms, etc. I'm running a vararam tune at 93 octane. The graph cortex has out for the tune leaves me to believe that when you shift you want to try and be as close to 4200rpm as possible to take advantage of the torque. We have heavy cars so we need some of that stump pulling power. I'm still looking for the stock shift point values so I know how much to increase my shift points by. Also trying to figure out what our engines can safely spin up to stock with all those AFM parts still in there.