TOO MUCH traction and you're advicing him to SLOW down!!
STIFFEN the suspension up.
LOWER the chassis to the minimum that is allowed/acceptable.
REDUCE Droop at both ends.
LESS Rear Toe-in to loosen the Car up.
CHANGE to Harder Tire compounds (do this last).
BTW, you didn't state what kind of Car we are talking about.
LASTLY, slow down only as a last resort.