I wish my tyres would look like that after 3 meetings
How much weight are you running in the car? If your not running any, adding the 87g lead ballast weight should help. Part No. 9776
Few things you could also try:
Short wheelbase
Lowering the inner ballstuds, i usually run 0.060" on my B44.1
Black roll bar on the back
Green rear springs.
If you could post your complete setup that would help
Ben