I have 4.56 gears in the car right now which are too steep. I was going to change to 4.11 gears but with this much slip I think I'll go with 3.89 gears. I haven't used WOT throttle yet. Today I hit if from a roll with 3/4 throttle. It went from 60 to 105 in three seconds and then I backed off. The converter slip went to about 30% when I rolled into the throttle and then gradually tightened up to about 10% by the time I started to lift. I suppose I won't know exactly what it does at the track until I do it but the data is telling me that it is going to be slipping at least 10% near the top end of the track.