I am running a Scout race for the first time with another dad. We put the 4 lane Best Track together and it is a mess. Cars were flying off left and right. We pointed the pins toward the finish line, changed panels around for the best fit and numbered everything. The track still does not mesh together well in certain areas. I have a sanding block and a multi-tool with triangle sanding block I can use to sand the rough spots on the track rails. What grit sand paper do you recommend and/or file? When finished, will clean the track with Pledge and paper towels. Any other suggestions are welcomed! Thanks.