1)make sure your on a stiffer cambered deck. Do not race on an rockered deck or hybrid deck. You want edge hold and camber is king at this.
2) go to a good tune shop and ask for a race specific tune, even ask around to some competitors to see where they are going. Edge hold is king.
3) Practice running gates on a slalom or gs course, hold your edge, no skidded turns. Edge hold is king.