John_S-
The ticket may be to not use the grey rears. I personally don't run those anymore it always (at my track) seemed that if I got out of the groove it'd take almost a lap to get the tires cleaned up and have traction again. When I switched to dbl pinks at all 4 corners or dbl pink front and pink rears even the car remained consistent and if I got off line I didn't struggle for almost a lap.
E