Please don't become a point and squirt merchant, if your car is fast on the straights, but someone is sat on your bumper lap after lap in the corners, just let them past. That is my one and only complaint on any trackday, i was pushing an rs4 round croft for many laps, and the cunt didn't have a clue how to drive the corners, even though the cones were out to mark the corners!
Just take your time and build it up gradually.