I do use RS tires. My suspension is: Ride height: 55/140. Spring rate: 8.77/9.25 dampers compression: 7/4 Dampers extension:2/8 Anti-roll bars: 1/1 camber angle: 0.0/0.0 toe angle: 0.00/0.00 I start in second gear quick shift into third gear and fairly quick into fourth.How do you shift it? Are you doing a 2-3 quickshift on the launch? What's your suspension look like? I assume you are using RS tires