We used the old 3 step the last 2 years, and with the World Cup in NYC we had very consistent times last year almost no change in times just like you. I am not sure what happened when I tried to use the DD4H graphite. It seems the wheels didn't sound as good dry spinning and the car was a little slower on track, when I put the other graphite on again I saw an improvement in track time and the wheel spinning on the axle was better also. Maybe I order another bottle of DD4H graphite. Maybe mine got some moisture in it one way or the other? This year we use Red Rocket for the first time and I really liked using it. Since we build a new car this year I cannot say how much impact the Red Rocket had but we were faster.