If the car spins out under power, out of the corner, use thinner oil in the center shock. Also get some plastic gloves and rub the traction compound into the tire.
If your car spins out in the middle of the corner, use softer greese/oil in the damper plate setup, use harder front springs, and/or apply traction compound on a smaller part of the front tires.
The first tips should give you more rear traction, the last ones will give the front less grip, do your car is better balanced.
Keep that in the back of your mind when using this kind of adjustments.
Sometimes it's better to change the blance of the car, instead of increasing the traction level.