A tire needs to be hit and held there to work, especially a radial or a slick on a marginal surface. Hit it hard and hold the tire down with the shock. So....hit it hard but what works well is to hit if for a tenth or two, then pull your launch retard and ramp it in. This helps hit the tire, keeping it there is the job of your shock. To go "fast" you need a good double adj shock. Tight compression keeps the tire planted. What also helps a lot is keeping the front suspension off the limiter. That's either a lot of travel or a tight shock ext setting or a combination of both.