Oh man, just copying the outlook idea of RnR will not give you any advantage. You need to copy the gameplay. Since you came so far, try to get original car speeds and original track widths/lengths. Now, make them a bit different (eg multiply by 1.2). You'll get the original fun factor of RnR and from here you'll be able to add more stuff of your own. Try to gather all the parameters from original game, including the amount of bonuses per track, I see you have dozens of them and they sure need to be balanced. Your issues doesn't come from RnR, your issues come from incomplete RnR understanding. Polish your analysis by checking more games of the same genre. I can't imagine how someone can blindly copy another game without knowing the entire genre... If this doesn't help you, you should uninstall WindowsXP.