Hey everybody new to the form. Background: my son sweep his pack the last two years last year at district and the council we took 7th. But this year we want to step up our game at district and council. We use a racing axle that is grooved out towards the head of the nail. Cog is alittle bit in front of the rear axle. We use graphite a good kind to. Oh and we run four wheels but only three touch. At his pack its a wooden track where at district its a aluminum track any tips I would appreciate.